11. Annual MT Meeting

3 Nov 2025, 10:00 → 6 Nov 2025, 15:00 Europe/Berlin

SB1 Lecture Hall (GSI)

Anke-Susanne Mueller, Friederike Januschek (DESY)

The 11th annual meeting of the program Matter and Technologies will take place at GSI in Darmstadt from November 3rd to November 5th (lunch-to-lunch).

The meeting will be accompanied by the MT Student Retreat for students and young postdocs (November 5th - November 6th), see Indico page for more information and registration.

 

 

GSI_Campusplan.pdf

MT2025-Group-1.jpg

MTAnnualMeeting2025Bulletin.pdf

Monday 3 November

On-Site Registration

Plenary: Opening plenary

1 Welcome at GSI

Speakers: Thomas Nilsson (GSI), Joerg Blaurock (GSI), Silvia Masciocchi (GSI and Uni Heidelberg)

1_20251103_MT-Meeting_rev05_final.pdf

2_MT_GSI_Opening3Nov.pdf

2 Introduction MT

Speakers: Anke-Susanne Mueller (KIT), Christina Widmann (KIT), Friederike Januschek (DESY), Ties Behnke (DESY)

MT_AnnualMeeting_Intro_c.pdf

MT_AnnualMeeting_Intro_c.pptx

3 PUNCH4NFDI federated infrastructures: current status and future perspectives in the light of a future NFDI

PUNCH4NFDI is a consortium in the NFDI representing the German particle, astro-, astroparticle, hadron, and nuclear physics community. The consortium currently has 20 co-applicant institutions with strong contribution by Helmholtz centres.
In the past four years, PUNCH4NFDI has pursued its aim of building federated infrastructure to facilitate FAIR data management for its community. The infrastructure consists of several elements which are – or will be – connected in a way that allows the user to almost seamlessly combine different elements as required for the individual use case. These elements include: federated compute and storage, metadata and file catalogues, a workflow engine, a registry for digital research products including a metadata schema for PUNCH.
This year, the consortium has written a proposal for a second 5-year funding phase, and almost in parallel an evaluation of the structure of NFDI, together with recommendations for the future, has been published.
In this presentation, we will discuss the achievements as well as the challenges encountered during the past years, and the plans for the future in PUNCH4NFDI also in light of the NFDI evaluation.

Speaker: Christiane Schneide (FTX (FTX Fachgruppe SFT))

20251103.MT-PUNCH.pptx

4 Dual isotope beams from SIS18

Speaker: David Ondreka (GSI)

MT11_Ondreka_Dual_Beams_SIS18_20251103.pdf

MT11_Ondreka_Dual_Beams_SIS18_20251103.pptx

5 The OCTOPUS Project: Towards a Vertex Detector for Higgs Factories

Speaker: Gianpiero Vignola (DESY)

2025-11-03-11thMT_OCTOPUS.pdf

6 Understanding warm dense matter from first principles

Speaker: Tobias Dornheim (HZDR/CASUS)

Dornheim_MT_Darmstadt_2025.pdf

7 Integrating the MIMOSIS Sensor in the CBM Micro Vertex Detector

The Micro Vertex Detector (MVD) is the first downstream detector of the fixed-target CBM experiment at the future Facility for Antiproton and Ion Research (FAIR). It enables high-precision tracking of low-momentum particles in direct proximity of the target with the first station being placed only 8 cm downstream the interaction point. The four planar stations operate in the target vacuum and are equipped with∼ 300 MIMOSIS CMOS Monolithic Active Pixel Sensors (MAPS). Those are produced in TJ-180 nm process and feature a 1024 × 504 pixel matrix (26.88 × 30.24 µm2 pitch) with a global shutter (5 µs nominal frame time). The final MIMOSIS will be submitted by the end of the year after several successful prototype generations have been developed through a joint R&D effort by IPHC Strasbourg, Goethe University Frankfurt and GSI Darmstadt. A large variety of different designs have been tested, such as standard and modified pixel variants, two epitaxial options (25/50 µm), and AC/DC-coupled front-ends. The performance has been tested both in the laboratory and with minimum-ionizing particles during beam tests. Furthermore, comprehensive tests of radiation tolerance, robustness against heavy-ion impacts and response to inclined tracks have been performed. Beam tests show > 99% detection efficiency and a 5–6 µm spatial resolution, also after irradiation to 5 Mrad and 1 × 1014 neq/cm2 (TID+NIEL), fulfilling the requirements. For integration in the MVD, the sensors will be wire-bonded to thin flex cables and glued onto Thermal Pyrolytic Graphite (TPG; 380 µm) carriers, which provide stiff, low-X0 support with a high in-plane thermal conduction (∼1500 W/m.K) in the acceptance. Actively cooled Aluminum heat sinks outside the acceptance extract the heat. Sensors are integrated on both sides of carrier to achieve 100% fill factor. In this contribution, we present the detector concept, results from the prototype MIMOSIS sensors and its integration into the CBM Micro Vertex Detector. A focal point will be the challenges associated with the stringent material budget constraints (0.3–0.5% X0) and vacuum operation as we progress toward station assembly and readiness for first beam in 2028.

Speaker: Franz Alexej Matejcek (IKF Universität Frankfurt)

2025-11-03_MVD-Integration_FMatejcek.pdf

15:15 Coffee/ Tea

Plenary: Strategy I

8 Germany‘s Fusion Strategy

Aktionsplan Fusion und Fusion 2040

Speaker: Christian Busch (VDI Technologiezentrum GmbH)

251103_Germanys Fusion Strategy.pdf

9 Strategy ARD

Speakers: Andreas Jankowiak (HZB), Hans Weise (DESY MSL (Supraleitende Beschleuniger Technologie))

2025-11-03-MT-Tage11-ARD-Overview+Strategy.pdf

Poster: Speed talks

10 Serenity-S: A versatile data processing card for CMS Phase-2

Speaker: Hendrik Krause (Karlsruhe Institute of Technology)

2025-11-03 MT-Meeting.pdf

11 REGAE - Time resolved diffraction with relativistic electrons

Speaker: Marie Kristin Czwalinna (DESY, MSK)

MT_2025_REGAE_czwalinna.pdf

12 QUASY- Quantum Sensor Platform for Synchrotron X-ray Spectroscopy

Speaker: Nik Arldt (Institute of Micro-and Nanoelectronic Systems, KIT; Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Germany)

Arldt_QUASY_Speedtalk.pptx

13 PM magnet development status for BESSY II+

Speaker: Ilia Asparuhov

spdtlk_MT_GSI_IA_2025.pdf

14 Building Software Communities in HEP - The HSF Experience

Speaker: Graeme Andrew Stewart (IT (Informationstechnik))

HSF-Experience-Lightning.pdf

15 Patch-MLP-Based Predictive Control: Simulation of Upstream Pointing Stabilization for PHELIX Laser System

Speaker: Jiaying Wang (HZDR)

MT_presentation_WANG.pptx

16 Production and characterization of ladders of the Silicon Tracking System for the CBM experiment

Speaker: Lady Maryann Collazo Sanchez (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

MT_speedtalk_LM.pdf

17 Upgrade of the Periodic HTS Quadrupole Magnet for Operation Beyond 1 kA

Speaker: Samira Fatehi (LAS, Karlsruhe institute of technology)

MT_Fatehi.pptx

18 A Q-switched Nd:YLF laser pumped by high-power LEDs

Speaker: Leon Dauerer (GSI)

A Q-switched NdYLF laser_Speedtalk.pptx

19 Burst-Mode CoRDIA – An Option for a Second-Generation Detector for the European XFEL

Speaker: Ulrich Trunk (FS-DS (Detektorsysteme))

BM-CoRDIA_Speedtalk.pptx

20 Vote of best speedtalk

SpeedTalkVoting.pdf

Walk to KBW Lecture hall for Poster Exhibition & Fingerfood Reception

Poster: Display and discussion

21 Radiation effects in silicon photonic modulators of the COTTONTAIL chip

We report on results of irradiation experiments with ring modulators and Mach-Zehnder modulators of our current silicon photonic transmitter chip COTTONTAIL. Ex-situ experiments on ring modulators show a significant degradation from a total ionizing dose of more than 3 MGy and a difference in low and high frequency behavior. Forward bias annealing can mostly restore the pre-irradiation characteristics, but can leave a small penalty of up to 3 dB, even after extended annealing. In-situ experiments for continuous measurements while irradiating are currently prepared for ring modulators as well as for Mach-Zehnder modulators.

Speaker: Marc Schneider (Karlsruher Institut für Technologie)

22 Status of Advanced Demonstrator project an futher developments on SRF Technology for HELIAC

The superconducting heavy ion HELmholtz LInear ACcelerator (HELIAC) is designed to meet the needs of the Super Heavy Element (SHE) research and material sciences user programs at GSI in Darmstadt. The beam energy can be varied smoothly between 3.5 and 7.3 MeV/u, with an average current of up to 1 emA and a duty cycle of 100~\%. Recently, the first cryomodule CM1, was commissioned and tested w/o beam. CM1 comprises three Crossbar H-mode (CH)-type accelerator cavities, a CH-rebuncher, and two superconducting solenoid lenses. Following the commissioning of the cryogenic supply and the RF-systems, successful beam tests were conducted. A helium as well as an argon ion beam was successfully accelerated to the design energy. This contribution covers the commissioning of the first HELIAC cryomodule and the future activities.

Speaker: Maksym Miski-Oglu (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

23 Continuous Imaging, >100kHz (Development of the CoRDIA detector)

CoRDIA (Continuous Readout Digitising Imager Array) is an X-ray imager being developed (as a collaboration between DESY and University of Bonn), for Photon Science experiments at Diffraction-Limited Synchrotron Rings and Continuous-Wave (or long-bursts) Free Electron Lasers.
Its goal is to be capable of continuous operation at 150k frame/s.
It aims at single-photon discrimination at 12keV (but is compatible also with high-Z sensors for higher energies) and a dynamic range of a few k photon/pixel/frame (extendable in High-Dynamic-Range mode).
It is composed by a battery of adaptive-gain amplifiers (similar to the AGIPD detector), Analog-to-Digital converters, and fast digital drivers (reusing the Gigabit Wire Transmitter principle from Timepix4), arranged in a pipelined, modular structure compatible with a compact pixel pitch (110um).

Speaker: Alessandro Marras (FS-DS (Detektorsysteme))

24 TEOBAM – Innovative mmW pickup structures: Development of an ultra-low-charge BAM pickup geometry for fC operation modes

Operating high-gain FELs with ultra-low bunch charges around 1pC or even less enables the generation of ultra-short, coherent pulses with significantly higher brightness, opening the path to explore processes at attosecond timescales [1,2]. Similar requirements exist for next-generation ultrafast electron diffraction (UED), which demands sub-pC bunches and arrival-time monitoring with single-digit femtosecond precision.
Bunch arrival-time monitors (BAMs) based on electro-optical (EO) methods are already established at facilities such as FLASH, EuXFEL,ELBE, SwissFEL, and others [3-5]. They provide quasi non-invasive measurements relative to a sub-fs synchronized laser pulse, reaching 3.5 fs resolution for 250 pC bunches at EuXFEL [6]. However, adapting
these systems for low-charge operation is necessary, since sensitivity strongly depends on bunch charge [7].
A previous project (05K19RO1) developed new broadband pickup structures exceeding 100 GHz bandwidth, showing promising results [8,9]. These concepts were further validated as a demonstrator at ELBE [10,11]. The proposed work aims to realize Mach-Zehnder-type EOMs and pickup structures with integrated networks to achieve sub-10 fs resolution for sub 1 pC bunches. Prototypes will be tested at facilities such as REGAE (DESY), FLUTE (KIT), ELBE (HZDR) to enable applications at EuXFEL, FLASH, and future FEL facilities.

References
[1] S. Reiche et al., DOI:10.1016/j.nima.2008.02.064
[2] J. B. Rosenzweig et al., 10.1016/j.nima.2008.04.083
[3] F. Löhl et al., DOI: 10.1103/PhysRevLett.104.144801
[4] S. Schulz et al., ISBN 978-3-95450-127-4
[5] S. Schulz et al., 10.18429/JACoW-FEL2019-WEB04
[6] M. K. Czwalinna et al., DOI: 10.18429/JACoW-?IPAC2021- THXB02
[7] A. Angelovski et al., Proc. IPAC’11, Paper: TUPC076
[8] A. Penirschke et al., DOI: 10.18429/JACoW-IBIC2019-WEPP019

Speaker: Bernhard Scheible (Technische Hochschule Mittelhessen)

25 Summarizing the serial test of the Xyter chip wafers for the CBM experiment.

The Compressed Baryonic Matter (CBM) experiment at the FAIR project is designed to study the properties of strongly interacting matter at high baryon densities, where conditions similar to those in neutron star cores can be created. It will use high-intensity heavy-ion beams from the SIS100 synchrotron to collide nuclei at energies of up to 11 AGeV for heavy ions. The detector system is optimized for rare probes such as dileptons, charm particles, and multi-strange hyperons, which provide insight into the QCD phase diagram at high densities. Therefore, the CBM will operate in a high-rate environment, processing up to 10 million collisions per second with fast and radiation-hard detectors and a free-streaming readout.
Two of the many subsystems at the CBM experiment will be digitalized using a custom-developed ASIC, known as the Xyter mixed analog digital chip. The STS (Silicon Tracking System): the main tracking detector placed inside the superconducting dipole magnet, providing precise momentum measurement and vertex reconstruction, and MUCH (Muon Chamber): a system of gaseous tracking detectors interleaved with absorbers, dedicated to identifying muons from vector meson and charmonium decays.
Last year, we developed and successfully utilized a serial test system comprising 80 wafers, each with 360 chips. Each chip was tested individually for various parameters under predefined conditions. The data was analyzed and displayed via a web interface almost immediately after the measurement was finished. The file for laser dicing of each wafer is automatically generated and in an industrial format. In this presentation, the system will be discussed, and a summary will be given.

Speaker: Irakli Keshelashvili (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

poster-Keshelashvili-MT.pdf

26 The High Brilliance Neutron Source (HBS-I) - A New National Research Infrastructure

Neutrons are an indispensable tool for science and industry to study the structure and dynamics of matter from the meso to the pico scale and from seconds to femtoseconds. An attractive way to provide urgently needed neutrons in the near future is to build efficient high-current, accelerator-based neutron sources (HiCANS) using pulsed proton beams.
A new national research infrastructure that benefits significantly from these developments will be the High Brilliance Neutron Source (HBS-I), which was recently shortlisted by the Federal Ministry of Research, Technology, and Space (BMFRT). HBS-I uses pulsed high-current proton beams to generate neutrons through a low-energy nuclear reaction in a target material, which requires less radiation shielding and moderator cooling compared to conventional neutron sources.
The facility is designed to produce small-diameter neutron beams, enabling experiments with smaller sample volumes. This will support research in materials and life sciences, including materials for energy conversion and storage, nanomaterials, quantum materials, protein structures, and biomaterials. The facility is intended for use by a multidisciplinary community of universities, research institutions, and industry. The basic concept and its realization will be presented.

Speaker: Andreas Lehrach (Forschungszentrum Jülich, RWTH Aachen University)

Poster MT 2025 AL.pdf

27 Towards axion searches with polarized hadron beams at GSI/FAIR

Polarized hadron beams provide a powerful tool for exploring interactions that are unobservable with unpolarized beams, particular for testing symmetry violations. Axions, originally introduced to solve the strong CP problem, are leading dark matter candidates appearing in various Standard Model extensions. At low masses, axion-like particle (ALP) dark matter behaves as a classical field, potentially detectable when its frequency resonates with a beam's spin-precession frequency.

The JEDI collaboration's proof-of-principle experiment at COSY set upper limits on oscillating EDMs caused by ALPs, though no signals were observed. This poster discusses COSY results and recent efforts to explore the feasibility of conducting axion search experiments using existing accelerators at GSI/FAIR with polarized hadron beams. Additionally, the latest simulation results will be presented, with a focus on the accelerator lattice optimization of the Spin Coherence Time.

Speaker: Daoning Gu (GSI /FZJ/RWTH)

28 Successes to rework CBM-STS detector ladders and modules

The CBM-STS, a silicon tracker based on double sided silicon microstrip sensors, is currently in full production. 876 detector modules are being assembled and further integrated onto 106 detector ladders which are linear subassemblies of 2 to 10 detector modules. Detector ladders will eventually be further integrated onto half units which will allow to instrument a 25° cone of acceptance with 8 tracking planes. Due to the fixed target forward boost experimental geometry, the 876 detector modules come in an extremely broad variety of about 200 different designs. The extremely high channel density makes the use of directly micro-bonded micro-cables indispensable. Originally each detector module as well as the detector ladders were considered monolithic devices that could not be reworked. During the course of serial assembly and the setbacks experienced, means of rework for ladders and modules could be worked out which will be presented in this contribution. This achievement makes the CBM-STS a much less monolithic device and consequently reduces the overall risk of failure in the project very significantly. The presentation demonstrates what kind of rework on the sensitive double sided silicon micro strip sensors is feasible.

Speaker: Oleksandr Suddia

MT annual meeting November 2025 O. Suddia.pdf

29 The Assembly and Integration of a Half-unit of the Silicon Tracking System (STS) Detector

The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) is designed to investigate the properties of strongly interacting matter at high net-baryon densities. A key component of the CBM experiment is the Silicon Tracking System (STS), which provides high-precision tracking of charged particles produced in heavy-ion collisions. Ensuring the proper assembly and integration of STS units is critical for the overall performance of the experiment. High tracking efficiency and vertex resolution of the STS are essential for rare probe measurements such as open charm and di-leptons, directly linking detector performance to the core physics goals of CBM.

This presentation focuses on the STS half-unit, aiming to develop, implement, and verify a reliable assembly and integration protocol. Prototype components were employed to simulate the mechanical assembly, ensuring safe handling before working with actual sensor modules and electronics. The protocol was designed for precise placement of all mechanical and electronic components, including ladders with mounted Front-End Board (FEB) boxes containing the front-end electronics (FEEs). The key phase of the study was verification of the cable routing, which involved configuring data and power connections between FEBs and the readout chain and ensuring proper alignment with the assembly layout. Special attention was given to the mechanical constraints of the half-unit, verifying that cable bends and routing paths did not interfere with module assembly or with future integration into the full STS system. This work represents the first verification of a half-unit assembly protocol, with validation of functional tests of the FEB boxes.

While the preliminary tests indicate that the assembly and routing procedures are effective, additional studies are planned to test the system under extended operational conditions and to verify long-term reliability. The outcomes of this work contribute to the overall preparation of the STS half-units for integration into the CBM experiment, ensuring that the modules meet the required standards for performance and stability.

Speaker: Gnana Sindhu Subramanya (Eberhard Karls Universität Tübingen(UT-PIT))

30 Update on TAF Project at the HI Jena

A new target area is set up at the Helmholtz Institute Jena. One central aspect are combined experiments with the laser systems JETi200 and POLARIS. Additionally, a new dedicated probe laser system, JETi ONE, was installed giving the opportunity to investigate laser-plasma interactions with few-cycle laser pulse ranging from the visible to the mid infrared spectrum. To synchronize these three laser systems a timing system was installed. Technical implementation and performance as well current developments will be presented.

Speaker: Alexander Sävert (Helmholtz Institut Jena)

31 A Low-Power LGAD–Timepix Dosimeter for Biological Space Radiation Monitoring

ALCYONE, an EU-funded project under the Horizon Europe program, investigates the impact of prolonged space exposure on biological systems, which is a critical challenge for future long-duration space missions. The project focuses on the development of a miniaturized on-chip micro-incubator to monitor and control environmental conditions for four types of cell cultures. To ensure precise radiation monitoring, a novel high-resolution dosimeter based on fine-pitch trench-isolated LGADs, coupled with Timepix front-end chips, has been developed and will be presented. The detector is seamlessly integrated into a compact, high-performance system-on-chip platform, enabling real-time processing of radiation fluence and dose.

Speaker: Nour Sharif (Karlsruhe Institut für Technologie)

32 Automation of GSI key beam manipulations with AI methods

We present the Geoff framework for automated accelerator tuning, demonstrated in real-world experiments at GSI. Using classical optimizers like BOBYQA, Geoff enables fast deployment, control room integration, and efficient beam optimization, reducing SIS18 injection losses from 45$\%$ to 15$\%$ and speeding up FRS setup. This work also reports the first application of multi-objective and multi-fidelity Bayesian optimization to SIS18 injection tuning. Complementary simulation studies employ model predictive control via model-based reinforcement learning for fast, constraint-aware tuning. These model-based methods outperform classical optimizers by guiding experiments with probabilistic surrogate and dynamic models.

Geoff’s modular design supports easy switching between algorithms and integration with modern ML tools, bridging accelerator operations and data-driven optimization.

Speaker: Sabrina Appel (GSI)

33 Towards a Scalable Data Readout System for Terascale Era Experiments

Future Terascale-era experiments require scalable, high-performance data acquisition (DAQ) systems to handle extreme data rates. We present a DAQ solution based on the Advanced Mezzanine Card (AMC) standard, under development for the Micro-Vertex Detector (MVD) readout chain of the PANDA experiment. This contribution emphasizes the system’s modularity and scalability. A preliminary test card, targeting the power supply architecture and Module Management Controller (MMC), has been assembled and evaluated. We present the test results and recent design improvements of the AMC module, demonstrating progress toward a robust and flexible DAQ platform for the demanding needs of next-generation high-energy physics experiments.

Speaker: Ms Olena Manzhura

34 Building Complex SoC Images Made Simple with SoCks

Modern System-on-Chip (SoC) devices are widely applicable; several boards in
the LHC Phase-2 upgrade use them. However, their growing complexity, along
with the increasingly intricate firmware and software development tools, makes
it difficult for developers to keep up. To address this, we propose SoCks, a
modular and scalable build framework for SoC devices that introduces a new
layer of abstraction and reduces dependencies wherever possible while making
the remaining ones comprehensible. Unlike previous approaches, SoCks enables
independent builds of the firmware and software components of the SoC image,
maintaining clearly defined interfaces to ensure the essential flow of information.

Speaker: Timo Muscheid

35 CryoDE: a Digital Cryogenic Detector Emulator for Microwave SQUID Multiplexed Systems

Modern experiments in the fields of particle and astroparticle physics are increasingly relying on quantum sensors to meet their scientific goals.
For instance, experiments that aim to measure the neutrino mass, search for the neutrinoless double beta decay, perform dark matter searches, or measure the polarization of the cosmic microwave background are all planning to utilize several thousand individual detectors.
Simultaneous readout of these large-scale detector arrays is enabled by employing multiplexing schemes such as the frequency-division SQUID multiplexer in combination with highly customized readout electronics.

The room-temperature readout system performs digital synthesis of the microwave tones necessary for resonator stimulation and conducts real-time signal processing of the modulated multiplexer data to ultimately reconstruct the raw detector data.
Current methods for testing and verifying the demodulation algorithms within the digital logic of the readout system are limited in functionality.
In contrast, hardware-in-the-loop (HIL) methods allow system evaluation by digitally emulating the detector signals while operating the room-temperature system in a loopback mode.
This HIL approach improves firmware development efficiency by enabling the iterative evaluation of the system without the additional complexity introduced by the cryogenic infrastructure.

Moreover, demodulating known input data allows for more precise calibration of the electronics compared to using unknown detector data.
In this contribution, we introduce a digital cryogenic detector emulator (CryoDE) for microwave SQUID multiplexed detector systems, capable of generating pulses and frequency-modulated detector signals.
This resource-efficient digital detector twin can be integrated into the FPGA firmware of existing DAQ systems, allowing the adjustment of the detector signal parameters according to the requirements of each experiment.
We describe the internal structure and features of the detector emulation system within our custom HIL framework.
Finally, we utilize the emulator to investigate the performance of our real-time signal processing firmware with parameters optimized for different microwave SQUID multiplexed-based experiments.

Speaker: Daniel Crovo

36 Production and characterization of ladders of the Silicon Tracking System for the CBM experiment

The Silicon Tracking System (STS) for the CBM experiment is designed to handle an interaction rate of 10 MHz. A specialized integration approach, where the readout electronics are located outside the sensitive volume, minimizes the material budget to 2 - 8% 𝑋0 while ensuring high granularity, precision, and timing accuracy. Each detector module features a double-sided silicon strip sensor connected to two Front-End Boards (FEBs) with eight custom-designed STS-XYTER ASICs via microcables.
After assembly, rigorous quality control procedures are performed, including time and amplitude calibration of all module ASICs, as well as thermal stress tests, to ensure reliable operation and precise data analysis.
After testing, the modules are attached to low-mass carbon fiber ladders, each of which can accommodate up to 10 modules. The first-of-series ladders have undergone further evaluation to confirm consistent functionality, including IV measurements, functional tests, simultaneous noise (ENC) characterization, long-run stability, and radioactive source irradiation measurements.
This study presents the current status of ladder production during the construction of the STS detector series. It offers key insights into the detector’s development and performance, with detailed studies on noise levels and signal response.

Speaker: Lady Maryann Collazo Sanchez (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

poster_MT_collazo.pdf

37 Building Software Communities in HEP - The HSF Experience

High energy physics has been evolving its software to meet the challenges of future accelerators and ambitious physics challenges, such as the HL-LHC. To encourage and promote a common understanding of the opportunities of future technologies the HEP Software Foundation (HSF) was started as an initiative in 2014. I outline the programme of the HSF and areas where it has been particularly successful, such as training and new language support, and how it has built a small, but dedicated, community of software enthusiasts for cross-experiment work. There are many useful lessons to learn for other current and aspiring community and common software projects.

Speaker: Graeme Andrew Stewart (IT (Informationstechnik))

HSF-Experience-Lightning.pdf

hsf-poster.pdf

38 Implementation of the Artificial Retina Method for Offline Analysis of Test-Beam Data for the ATLAS New Small Wheel Micromegas

Detector performance studies, which emphasise on spatial resolution and detector efficiency, require the generation of an external particle track to probe the detector under testing. The Artificial Retina method provides a set of weights for the cluster centroids, which reproduce the particle track, thus supporting the reconstruction of the particle track. A series of Monte-Carlo simulations have been conducted, which provide insight on the sub-processes and limitations of the Artificial Retina. Additionally, the method has been implemented on the analysis of test-beam data for the ATLAS New Small Wheel Micromegas detectors, which validates the method and its effectiveness.

Speaker: Athanasios Koutsostathis (Institut für Beschleunigerphysik und Technologie, Karlsruher Institut für Technologie)

39 Performance of the prototype Silicon Tracking System of the CBM experiment tested with heavy-ion beams at SIS18

The Compressed Baryonic Matter (CBM) experiment at the upcoming Facility for Antiproton and Ion Research (FAIR) aims to explore nuclear matter at extreme baryon densities. To achieve event rates of up to 10⁷ per second for rare probes, it relies on fast, radiation-hard detectors, self-triggered front-ends, free-streaming readout, and online reconstruction. Its main tracking detector, the Silicon Tracking System (STS), is designed to reconstruct charged-particle trajectories with over 95% efficiency, a momentum resolution better than 2% for momenta above 1 GeV/c in a magnetic field, and to identify complex decay topologies. The STS consists of 876 double-sided silicon strip modules arranged in eight tracking stations.
A prototype of this detector, consisting of 12 modules arranged in three tracking stations, was installed in the mini-CBM demonstrator. This experimental setup is a small-scale precursor to the full CBM detector, comprising sub-units of all major CBM systems installed on the SIS18 beamline. In various beam campaigns taken between 2021 and 2024, heavy-ion collisions 1–2 AGeV with an average collision rate of 500 kHz have been recorded.
This allows for the evaluation of the operational performance of the STS detector, including time and position resolution, hit reconstruction efficiency, charge distribution, signal-to-noise ratio, and its potential for track and vertex reconstruction.

Speaker: Dario Alberto Ramirez Zaldivar (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

40 iLIGHT - Laser Accelerated Ions in the SIS18

The Laser Ion Generation, Handling and Transport (LIGHT) beamline at GSI forms part of the ATHENA distributed facility, which is primarily concerned with the manipulation of phase space in laser-generated ion beams. In recent years, the LIGHT collaboration has achieved the routine generation and focusing of intense 8 MeV proton bunches with a temporal duration shorter than 1 ns (FWHM).
In numerous accelerator facilities, linear accelerators are employed to accelerate ions to several MeV, which can then be injected into a synchrotron for post-acceleration. Given that high-power laser systems can also be employed to provide ions with such energies via target normal sheath acceleration (TNSA), it is conceivable that they could serve as an alternative ion source for synchrotrons in the future, particularly if the repetition rates of advanced laser systems align with those of linear accelerators. This concept has the potential to reduce the injection time, provide ion beams with lower emittances, and reduce the cost and size of future accelerator facilities.
However, since the initial TNSA-generated ion beam typically exhibits a high energy spread and a large initial divergence, it is necessary to adjust the beam to obtain a sufficient number of particles within the acceptance range of the synchrotron. In this regard, conventional accelerator structures may be employed, as exemplified by the Laser Ion Generation, Handling and Transport (LIGHT) beamline. The laser-driven beamline is situated at GSI in close proximity to the transfer channel between the Universal Linear Accelerator (UNILAC) and the Heavy Ion Synchrotron SIS18, which renders this experimental area optimal for a preliminary proof-of-principle experiment.
With this poster, I will first describe the setup and working principle of the LIGHT beamline. I will then summarize the capabilities of the LIGHT beamline and the current status of ongoing projects, with a particular focus on the injection of LIGHT protons into GSI's Heavy Ion Synchrotron SIS18.

Speaker: Haress Nazary (GSI / TU Darmstadt)

41 REGAE - Time resolved diffraction with relativistic electrons

Ultrafast electron diffraction (UED) allows studying dynamical processes with femtosecond time resolution at the atomic scale. Due to their strong interaction with matter, electrons are particularly suited for the investigation of very thin samples. For such UED experiments DESY in Hamburg has built and is operating the REGAE facility, being currently the only operating UED facility in Europe.
REGAE is based on a RF-operated linear accelerator which produces short electron pulses with energies of 2 MeV - 5 MeV. A buncher cavity allows to further compress the bunches and allows to conduct experiments with a time resolution of better than 20 fs. For electron diffraction experiments from solid samples REGAE is equipped with a high-precision crystallography goniometer. For recording of diffraction patterns, the instrument is equipped with a integrating Jungfrau 1M detector, capable of direct electron detection with single electron sensitivity and single shot experiments.
In a first demonstration experiment we were able to solve and refine the 3D atomic structures of the layer silicate muscovite and the incommensurate structure of quantum material tantalum disulfide (TaS2) with a great level of detail and at high quality.
For time resolved diffraction experiments REGAE is equipped with a pump laser system providing wavelengths of 800 nm and 400 nm. The system is currently being upgraded with a NOPA to provide a larger pump wavelengths range and a cryo-cooling system for conducting diffraction experiments at temperatures down to 10 K.

Speakers: Dr Holger Schlarb (DESY), Marie Kristin Czwalinna (DESY, MSK)

42 Upgrade of the Periodic HTS Quadrupole Magnet for Operation Beyond 1 kA

A periodic HTS quadrupole magnet demonstrator for compact beam transport lines has recently been developed and tested at KIT. The magnet is powered by pancake coils wound from 12-mm ReBCO tape and reached an operating current of 1 kA at 4.2 K. To enable stable operation at currents beyond 1 kA, an upgraded mechanical design has been introduced. This includes reinforced clamping, improved soldering, and enhanced thermal management, aimed at distributing forces more evenly and reducing mechanical stress, particularly at the coil interconnections.
During the disassembly of the previous bridge structure, mechanical damage to the coils was discovered. The coil winding is in progress, and experimental validation of the upgraded design is planned at liquid nitrogen and liquid helium temperatures.

Speaker: Samira Fatehi (LAS, Karlsruhe institute of technology)

43 Helmholtz AI Consulting for Matter Research

The Helmholtz AI consultant teams can provide support with their deep expertise in applied AI, tools and software engineering for research projects. Working with our consultants comes at no cost, as collaborations are entirely scientific. Matter research at Helmholtz is a vast and heterogeneous academic field driven by experiment and simulation of unprecedented scale and quality. The Helmholtz AI consultant team led by Peter Steinbach supports these in extracting knowledge from image (radiograms or microscopy images) or table like datasets (Xray scattering, accelerator monitoring). Furthermore, we are invested in Uncertainty Quantification and Simulation-Based Inference as well as studying how large language models deal with physics data.

Speaker: Peter Steinbach (HZDR)

44 Patch-MLP-Based Predictive Control: Simulation of Upstream Pointing Stabilization for PHELIX Laser System

Facilities equipped with high-energy lasers such as PHELIX at GSI require excellent beam pointing stability for reproducability and relative independence for future experiments. Beam pointing stability has been traditionally achieved using simple proportional–integral–derivative (PID) control which removes the problem of slow drift, but is limited because of the time delay in knowing the diagnosis and the inertia in the mechanical system associated with mirrors. In this work, we introduce a predictive control strategy where the forecasting of beam pointing errors is performed by a patch-based multilayer perceptron (Patch-MLP), and the subsequent conversion of these predicted errors into correction signals is handled by a PID controller. The neural network has been trained on diagnostic time-series data to predict beam pointing error. Using the feed-forward controller compensates for system delays. Simulations with a correction mirror placed upstream of the PHELIX pre-amplifier bridge confirm that the predictive control scheme reduces residual jitter compared to conventional PID control. Over a 10-hour dataset the controller maintained stable performance without drift, while standard pointing metrics showed consistent improvements of the order of 10%–20%. The predictive controller operates without drift, and therefore may improve reproducibility and operational efficiency in high energy, low repetition rate laser experiment conditions.

Speaker: Jiaying Wang (HZDR)

MT_presentation_WANG.pptx

45 Soft and hard x-ray spectroscopy with a novel calorimetric superconducting quantum sensor

X-ray spectroscopy at synchrotron light sources has emerged as one of the most powerful tools available for the characterization of the chemical, atomic, and electronic properties of materials. Existing x-ray spectrometers provide either excellent energy resolution at low efficiency or moderate energy resolution at high efficiency. Magnetic microcalorimeters (MMCs) may be a “gamechanger” as they promise outstanding energy resolution (already achieving a ΔE_FWHM of 1.25 eV at 5.9 keV [1]), a large energy bandwidth, and extremely high detection efficiency. MMCs are ultra-sensitive cryogenic detectors, which rely on converting the energy from incident photons into heat. Using a sensitive thermometer based on the temperature-dependent magnetization of a paramagnetic material in a weak magnetic field, the change in magnetization due to an incoming photon is sensed with a superconducting quantum interference device (SQUID) [2].
We are currently investigating the feasibility of such a x-ray quantum sensor array at multiple synchrotron-radiation beamlines (i.e., X-SPEC, CAT-ACT, INE, and SUL-X) at the KIT Light Source using a universal, compact, and modular platform. The new instrumentation will not only greatly advance the available experimental techniques but also allow for the study of samples containing radionuclide materials with low concentrations, and/or in in situ and operando environments. In this contribution, we will show the current design concept of the detector platform as well as UO₂ measured at the O K-edge with resonant inelastic (soft) x-ray scattering (RIXS) measured at the X-SPEC beamline, which will also be one of the first test materials for the MMC detector.

[1] Krantz, M.; Toschi, F.; Maier, B.; Heine, G.; Enss, C.; Kempf, S. Magnetic Microcalorimeter with Paramagnetic Temperature Sensors and Integrated Dc-SQUID Readout for High-Resolution X-Ray Emission Spectroscopy. Appl. Phys. Lett. 2024, 124 (3), 032601. https://doi.org/10.1063/5.0180903.
[2] Kempf, S.; Fleischmann, A.; Gastaldo, L.; Enss, C. Physics and Applications of Metallic Magnetic Calorimeters. J. Low Temp. Phys. 2018, 193 (3–4), 365–379. https://doi.org/10.1007/s10909-018-1891-6.

Speaker: Mary Blankenship (Karlsruhe Institute of Technology)

46 Adaptive Laser Architecture Development and INtegration (ALADIN) - Towards Inertial-Fusion Ready Beam Control

Achieving inertial fusion energy (IFE) requires laser systems capable of delivering hundreds of high-power, high-repetition-rate beams with exceptional stability. The ALADIN project (Adaptive Laser Architecture for Dynamic INertial fusion) addresses this challenge by developing adaptive laser control technologies that enable reliable, repeatable fuel compression in direct-drive IFE schemes. ALADIN focuses on three key objectives: (1) the integration and automation of adaptive laser architectures (ALA) to coordinate thousands of active components across large facilities through an open-source control framework; (2) the advancement of real-time adaptive optics and beamline control to ensure stable laser performance at 10 Hz operation; and (3) the expansion of spatiotemporal pulse-shaping capabilities to optimize fuel compression. By combining hardware innovation, control software development, and real-time diagnostics, ALADIN aims to raise the technology readiness of ALA systems and establish a long-term European competence network in laser stabilization for IFE.
On this poster, we present the goals, the structure and the status quo of ALADIN.

Speaker: Jonas Ohland (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

47 Latest results of multicore fiber laser systems

Fiber laser systems are reputed for being able to provide emission at high average powers while keeping nearly diffraction-limited beam quality. However, achieving pulsed operation with high energies and peak-powers has traditionally been a challenge due to the small confinement of the light in the fiber causing the onset of nonlinear effects. Parallelization of the amplification process allows to overcome this limitation. Multicore fibers, have potential to allow for laser systems with a massive number of amplification channels while maintaining a compact footprint and manageable component count. In this contribution, we will present our latest results achieved with different type of multicore fibers. This includes the conversion of nanosecond pulses to the second harmonic. Additionally, dynamic beam shaping can be achieved with femtosecond pulses by fast phase-only control of the individual beams emitted by the fiber. Finally, we will also present the first multicore fiber with multi-kW average power capabilities. Systems based on these fibers will have a wide variety of applications, ranging from pumping future Ti:Sa laser systems to the generation of EUV and x-ray radiation.

Speaker: Arno Klenke (Helmholtz-Institut Jena)

48 Quality factor analysis of surface-passivated cavities at low gradients applying Two Level System models

The native oxides of niobium cause surface losses during cavity operation arising from two-level systems/defects (TLS). These losses dominate the quality factor at low accelerating gradients (Eacc < 0.1 MV/m). In particular, the amorphous Nb2O5 is identified as a prominent host for the TLS. Nb2O5 dissociates when the material is baked above 200 °C for several hours in vacuum (the so-called Mid-T Bake), allowing for the modification or reduction of these losses. However, due to the inevitable exposure to air after the annealing, the surface reoxidizes and Nb2O5 regrows. When the cavity is already coated with Al2O3 or Ta2O5 and then subjected to the Mid-T Bake, this subsequent reoxidation of the niobium is inhibited.
It is still unclear how the TLS losses are modified when the surface undergoes a passivating coating, and this study aims at possibly finding a correlation between the different passivating layers.
Herein, we studied the quality factor of several superconducting radio frequency cavities in the low gradient range (Eacc < 0.1 MV/m) at 1.5 K and analyzed the data using TLS models like the standard TLS model and the non-interacting TLS (one species and two species). Specifically, we used cavities that had undergone the standard “European XFEL” treatment, followed by an atomic layer depositing coating with a passivating layer and the subsequent Mid-T Bake.

Speaker: Rakshith Venugopal (Deutsches Elektronen-Synchrotron DESY)

49 A Q-switched Nd:YLF laser pumped by high-power LEDs

Right now, high-intensity and high-energy laser systems are pumped by flash lamps or laser diodes. The flash lamps have a very large emission bandwidth (>2000 nm), which makes them inefficient and limits the repetition rate of the laser, while the narrow-bandwidth laser diodes (2-6 nm) remain very expensive (30-50$/W). These characteristics are problematic for the application for laser driven fusion, because a commercially-functioning power plant would require high repetition rates,high efficiency and low costs. In this contribution, we focus on the question if LEDs can serve as a good compromise between flash lamps and laser diodes.

In the past years, LEDs have developed tremendously as well as in cost as in performance. For example, the price for light (per kilolumen) dropped by a factor of 15 over the course of the last decade, driven by the lighting industry. In addition, the performance/efficiency increased over time. They have an acceptable bandwidth (20-60 nm), so there is significantly less unnecessary energy deposited in the amplifier material compared to flash lamps. In comparison to the laser diodes, they are a lot cheaper (20-40 ct/W). However, LEDs still exhibit low emission power densities, which has been regarded as a challenge for laser applications. A work around is the possibility to overdrive LEDs in pulsed operation mode, which has received little attention so far.

In this contribution, we report on the development of a actively Q-switched Nd:YLF laser pumped by high-power LEDs. The laser is designed to work in cavity-dumped mode and the performance is presented. The LEDs, which we employed, are the BestSMD-2835FIRC81L42I1A LEDs which emit at 810 nm, making them suiatble for side-pumping nedoymium-doped rods.

Alse the new OSRAM LED generation has been studied. We investigated the power, efficiency and power density as well as the temperature and the spectrum for different forward currents of single LEDs cooled and uncooled.

Future plans are to improve the laser head design to enable cooling and index matching. Additionally, the new OSRAM LEDs will be used to enhance the overall performance of the laser.

Speaker: Leon Dauerer (GSI)

50 Development of new optics for Super-FRS

Most fragment separators can be operated in two different ion-optical modes: An achromatic mode and a dispersive mode, depending on the user requirements.
This project aims to develop additional optical modes for FAIR’s Super-FRS besides the standard optics, as well as user-specific adaption of the settings to meet requirements in terms of acceptance, transmission, spot-size and purity.
To achieve this goal, high-order optical calculations in connection with matter interaction (target, wedges, detectors) and cuts (slits and apertures) have to be performed. These calculations will be created in a way that allows for optimization with gradient-free or gradient-based optimizers.

Speaker: Daniel Kallendorf (TU Darmstadt)

51 Efficient bunch parameter reconstruction from an electron synchrotron with a GPU

KARA (KArlsruher Reasearch Accelerator) is a 2.5 GeV synchrotron light source. The electrons are accelerated in three stages: the microtron, the booster, and the storage ring. In the booster synchrotron, the position of the electron beam is monitored using Beam Position Monitors (BPMs). These BPMs detect the electromagnetic fields induced by passing bunches. The resulting signals, such as the sum of all four electrodes, can be further analyzed with the KAPTURE2 system, which samples the
electron bunches at eight points using a track-and-hold technique.
The goal of this project is to enable real-time or near real-time analysis of the acquired signals. To achieve this, the large data streams must be processed quickly and efficiently. Therefore, the computational workload is accelerated using a GPU, leveraging its parallel processing capabilities. In addition, an approach for parallelization on the CPU is evaluated to determine its effectiveness compared to GPU acceleration. This comparison helps to assess performance gains while considering the potential overhead caused by data transfer between the CPU and GPU, which can significantly affect overall efficiency. This comparison also evaluates two methods for bunch reconstruction - QR decomposition and gradient-based least-squares minimization.

Speaker: Martin Krausewitz (KIT)

mt25_poster.pdf

52 Domain Transfer from Simulation to Experimental Neutron and X-ray Reflectivity Data Using Probabilistic Generative Models

Machine learning (ML) models trained on classical simulations often face challenges when applied directly to experimental data due to significant domain gaps, as simulations cannot fully replicate real-world conditions. We address this issue specifically in neutron and X-ray reflectivity analysis, where determining thin film parameters from reflectivity curves is an inherently ambiguous inverse problem due to the lack of phase information. Traditional neural networks typically provide either a single or averaged solution, failing to represent the full range of possible physical parameters inherent in the problem.
In this study, we employ conditional normalizing flows (cNFs) combined with an embedding network based on β-Variational Autoencoders (β-VAEs) to encode reflectivity curves and effectively learn the full distribution of physical parameters. To further improve performance on experimental data, we systematically explore three strategies for bridging the simulation-experiment domain gap: (1) fine-tuning simulation-trained models with labeled experimental data, performing a comparison between fine-tuning the flow and embedding network separately; (2) utilizing generative networks to create realistic synthetic datasets or to transform experimental data to resemble simulations; and (3) introducing a novel physics-informed approach, which leverages the known physical relationship between scattering length density (SLD) profiles and reflectivity curves. We use a differentiable forward function, relying on the kinematic approximation, to guide generated sample parameters via physics-informed loss during bidirectional training of cNFs.
Our approach distinctly leverages unlabeled experimental data to address cNF performance challenges on real-world reflectivity data. Additionally, this methodology can be broadly applied beyond neutron and X-ray reflectivity, benefiting other scientific domains facing similar inverse problems and domain-transfer challenges.

Speaker: Jeyhun Rustamov (Helmholtz-Zentrum Dresden-Rossendorf)

53 New AGIPD Detectors and Developments for the European XFEL

The Adaptive-Gain Integrating Pixel Detector (AGIPD), a megahertz frame-rate, high-dynamic range integrating pixel detector, was developed for photon science experiments at the European X-Ray Free Electron Laser (European XFEL) and tailored to its unique specifications. Two 1-Megapixel AGIPD detector systems have been installed at the European XFEL and are producing numerous scientific publications. In order to further improve the existing systems, and to provide dedicated systems for two user consortia, we have been developing the next generation of hardware. In this poster, we present the current state of development of the two new AGIPD systems, as well as improvements to the two AGIPD systems in operation at EuXFEL.

Speaker: Ulrich Trunk (FS-DS (Detektorsysteme))

54 Operando Beamline for Solar Cell Characterization under Proton Irradiation

Since the observation of the radiation hardness of Perovskite-semiconductors compared to traditional semiconductors, the interest in Perovskite solar cells for space applications increased tremendously. First tests on the radiation hardness of Perovskite multi junction solar cells support this. However, further experiments with highly efficient Perovskite tandem and triple cells are necessary.
For this purpose, a unique inOperando beamline is built, where new solar cell technologies can be characterized before, during and after proton irradiation with parallel illumination by an AM0sun simulator. Combined with in-situ photoluminescence this will increase the physical understanding and allow technological progress of solar cells.

Speaker: Andrea Denker (Helmholtz-Zentrum Berlin)

55 MALTA — Rad Hard Monolithic Pixel Sensors in Tower 180 nm for Tracking and Timing

Depleted Monolithic Active Pixel Sensors are of highest interest at the HL-LHC and beyond for the replacement of the Pixel trackers in the outermost layers of experiments where the requirement on total area and cost effectiveness is much bigger. They aim to provide high granularity and low material budget over large surfaces with ease of integration. Our research focuses on MALTA, a radiation hard DMAPS with small collection electrode designed in TowerJazz 180 nm CMOS imaging technology and asynchronous read-out. Latest prototypes are radiation hard up to 2 × 1015 1 MeV n/cm2 with a time resolution better than 2 ns.

Speaker: Steven Worm (Z_DET (Detektorentwicklung))

56 PIConGPU: Advancing Laser Plasma Accelerator Simulations at Exascale

PIConGPU is an advanced particle-in-cell simulation code designed to model laser-driven plasma accelerators. With the power of Exascale computing, PIConGPU enables the study of plasma accelerators with unparalleled resolution and physical detail. We will showcase our recent research on laser-driven acceleration of ions and electrons, with a focus on its applications in advanced accelerator design. We will also introduce our new python-based simulation input system built on the PICMI standard, which simplifies simulation setup and execution. Finally, we will present our implementation of complex workflows that are essential for optimizing particle accelerators, enhancing diagnostic tools, and enabling more accurate and realistic simulations.

Speaker: Richard Pausch (HZDR)

57 Post-processing of emittance optimization measurements at PITZ

The Photo Injector Test facility at DESY in Zeuthen (PITZ) is a dedicated test stand for research and development of RF photo-injectors and, in addition, is used to condition and characterize L-band electron guns for European XFEL and FLASH. Recently, a series of measurements were taken at PITZ to optimize the transverse emittance by varying the photo-laser spot size and the gun solenoid strength. These measurements were taken at 18 MeV/c using a single slit scan and imaging the beamlets on a YAG screen. The measured data was later further analyzed to correct for systematic errors including the slit width and imaging resolution when calculating the emittance. This further processing significantly altered the measured emittance trends and changes the required laser spot size and solenoid strength to minimize the emittance. In addition, the x and y slit scan measurements were combined using the Virtual Pepper Pot method to reconstruct the 4D phase space. This revealed significant, asymmetric x-y coupling in the beam. The cause of the coupling is still under investigation.

Speaker: Christopher James Richard (Z_PITZ (Betrieb und Forschung))

58 Evaluation of Lattice Robustness and Correction Strategies for BESSY III

The BESSY III project aims to develop a fourth-generation light source operating in the soft X-ray regime, providing unprecedented beam stability and brightness. To meet these goals, comprehensive simulation studies are carried out to assess and enhance the robustness and reliability of the storage ring lattice. The robustness analysis enables direct comparison of the BESSY III lattice performance with other fourth-generation facilities under realistic error conditions. Subsequently, the simulated commissioning process focuses on restoring optimal lattice performance by mitigating these perturbations, primarily through beam position monitors (BPMs) and corrector magnets. This work quantifies the achievable machine performance by simulating the complete commissioning chain, including optimization of beam transmission and on-axis injection efficiency, sextupole ramp-up, RF cavity correction, beam-based alignment (BBA), orbit correction, and LOCO-based optics correction. The results provide essential feedback for defining the commissioning strategy and enhancing the overall resilience of the BESSY III lattice design, forming a key contribution to the upcoming conceptual design report.

Speaker: Beñat Alberdi Esuain (Helmholtz-Zentrum Berlin)

59 Synthetic Radiation Diagnostic in Hybrid LPWFA

We present a study of a radiation signal in laser-driven plasma wakefield accelerators (LPWFA) employing photo cathode injection. While experimentally observed and significant for timing calibration, its underlying physics remains elusive. Using a synthetic optical imaging plugin for PIConGPU we reproduce this signal in simulations for the first time, linking it to plasma structures and cavity dynamics. By analyzing the images alongside 3D, time-resolved particle distributions, we trace the formation of distinct scattering patterns, offering new perspectives on plasma dynamics.

Our synthetic diagnostic enables self-consistent imaging of plasma structures in laser-plasma accelerators. By integrating electromagnetic fields from the PIC simulation and propagating them via Fourier optics methods onto a virtual screen, we generate synthetic images that resemble experimental measurements. This approach allows direct comparison with experiments, providing insights into plasma dynamics and laser-plasma interactions.

These results highlight the potential of synthetic optical imaging to improve experimental diagnostics in laser-plasma accelerators, such as shadowgraphy, and to deepen our understanding of scattering processes in wakefield acceleration.

Speaker: Finn-Ole Carstens (Helmholtz-Zentrum Dresden-Rossendorf (HZDR))

60 Uncertainty-aware Modeling of Magnetic Field and Alignment Errors in the Super-FRS

For maintaining the designed optical performance of the Super-FRS, accurate knowledge of magnetic field quality and element alignment is crucial. Existing beam-based alignment methods can determine quadrupole axes but are experimentally extensive and not practical for routine use. Some cross-talk errors cannot be measured in advance, since, for example, three dipole magnets (or a dipole and a multiplet) cannot be measured together. Detector positioning uncertainties further complicate beam-based diagnostics. This PhD project aims to develop a beam-based framework to infer such error sources from operational beam data. As a first step, the influence of quadrupole misalignments on resolution will be studied. A physics-informed Gaussian Process model will be explored to combine beam optics knowledge with probabilistic regression, which can be readily extended to Bayesian optimization. This approach could lay the groundwork for uncertainty-aware model refinement and steps toward a data-driven digital twin of the Super-FRS.

Speaker: Victoria Isensee (GSI)

61 Commissioning Status of the Upgraded FLUTE RF System

FLUTE (Ferninfrarot Linac- Und Test-Experiment) is a compact versatile linear accelerator at KIT. Its main goal is to serve as a platform for a variety of accelerator studies as well as a generation of strong ultra-short THz pulses for photon science. Also, it will be used as an injector for a Very Large Acceptance compact Storage Ring (VLA-cSR) which is being realized at KIT in the framework of the compact STorage Ring for Accelerator Research and Technology (cSTART) project. To achieve acceleration of electrons in the RF photo-injector and linac with high stability, it is necessary to provide stable RF power. For this goal, an upgrade of the existing RF system design was proposed and is currently being implemented. In this contribution an updated RF system design and the status of the RF photo-injector, linac and bunch compressor commissioning will be reported

Speaker: Anton Malygin (Karlsruhe Institute of Technology)

62 High-Z sensors at MHz repetition rate FELs: first AGIPD results

To address new applications in the 20–30 keV photon energy range at the European XFEL, where silicon sensors lose quantum efficiency, the AGIPD consortia has developed an AGIPD detector prototype with high-Z sensor materials. An electron-collecting version of the chip (ecAGIPD) was designed to leverage from the higher mobility and longer lifetime of electrons with respect to holes in the candidate materials: chromium-doped gallium arsenide (GaAs:Cr) and high-flux cadmium zinc telluride (CdZnTe). This work reports on the characterization of GaAs and high-flux CdZnTe ecAGIPD prototypes at the HED instrument at the European XFEL. Their time response, linearity and performance at 2.2 and 4.5 MHz frame rates were evaluated. Preliminary results demonstrate good linearity of both materials up to 1.6e+03 15 keV photons/mm2/pulse, and a residual after-pulse signal corresponding to less than one photon on CdZnTe, up to an estimated flux of 1.2e+05 24 keV photons/mm2/pulse.

Speaker: Heinz Graafsma (FS-DS (Detektorsysteme))

63 Serenity-S: A versatile data processing card for CMS Phase-2

The upcoming high-luminosity upgrade of the Large Hadron Collider (HL-LHC) necessitates the replacement and updating of several sub-detectors within the Compact Muon Solenoid (CMS) experiment. A key challenge of this upgrade is the backend data processing of multiple terabytes of data generated from hundreds of millions of collisions each second. This processing is handled by the L1-Trigger system, which comprises hundreds of state-of-the-art FPGAs connected via high-speed optical links reaching up to 25 Gb/s. For this system we have contributed in the Serenity colaboration to develop Serenity-S, a versatile FPGA processing card based on Advanced Telecommunications Computing Architecture (ATCA) technology fitting the requirements of the backend systems of multiple sub-detectors. The card is designed with a modular philosophy, including a space-optimized service area to provide the ATCA infrastructure, advanced board management features, and a performance-optimized payload area featuring one of the most powerful FPGAs commercially available. This FPGA supports 124 bidirectional high-speed links, enabling data processing rates of up to 3.1 terabits via synchronous or asynchronous clock paths. In total more than 700 of these cards will be produced for multiple CMS systems with emphasis on to the sub-detectors HGCAL (300) and Tracker (216).

Speaker: Hendrik Krause (Karlsruhe Institute of Technology)

MT-Poster-Serenity-v2.pdf

64 From Simulation to Reality: Patterns in Building Digital Twins for Accelerators

Digital twins are increasingly used to support accelerator commissioning and operation. Beyond accurate simulations, much of the effort lies in connecting real-world data streams and control systems with their virtual counterparts. This talk presents recent developments toward flexible, modular architectures that enable seamless exchange between measurement, modeling, and control. Emphasis is placed on strategies that reduce computational load, support model substitution, and maintain consistency across changing machine configurations. Parallels to digital-twin development in other large-scale scientific and industrial environments are briefly outlined.

Speaker: Waheedullah Sulaiman Khail (HZB)

65 Pulse-scan analysis of the amplitude response in SMX-based double-sided microstrip silicon detectors

The characterisation of self-triggering front-end electronics is essential for understanding their timing behaviour, signal fidelity, and stability under high-rate conditions. We focus on the SMX ASIC developed for silicon microstrip detectors, integrating a shaping and discrimination chain with a 5-bit flash ADC and 14-bit signal arrival timing. The chip provides a dynamic range up to ~94 ke in standard gain (and ~625 ke in low-gain mode), intrinsic noise of ~350 e ENC (rising to ~1000 e for full module load), and a typical peaking time between 90-280 ns, making it suitable for high-rate tracking applications.

A waveform reconstruction based on the pulse-scan method is employed to analyse analogue response and triggering characteristics of double-sided double-metal (DSDM) Silicon Tracking System (STS) modules. These modules, developed for the CBM experiment at FAIR and adapted for the E16 experiment at J-PARC, provide a convenient testbed for studying shaping, sampling, and digitisation dynamics in realistic conditions.

Complementary S-curve analyses were refined by introducing skewness parameters and weighted averaging across multiple discriminator fits to capture asymmetries and correlations in discriminator response. The combined pulse-scan and S-curve approaches offer improved evaluation of the equivalent noise charge (ENC) and cross-validation of waveform-based results. Together, they provide a quantitative framework for optimising the performance of self-triggering detector systems.

Speaker: Yejun Cho (GSI Helmholtzzentrum für Schwerionenforschung GmbH (GSI))

66 QUASY- Quantum Sensor Platform for Synchrotron X-ray Spectroscopy

Magnetic microcalorimeters (MMCs) are energy-dispersive single particle detectors that promise exceptional energy resolution and high quantum efficiency. Their potential has led to growing interest across various disciplines, including basic science, medicine, astrophysics, and materials research. Especially for X-ray spectroscopy at brilliant light sources, precise energy, time, as well as spatial resolution are essential to characterize the chemical and electronic structure of samples and their temporal evolution during chemical reactions.
Within this context, we are developing a modular and transportable detector system based on a microfabricated 64-pixel MMC array optimized for the soft and tender X-ray regime. The prototype array was designed and fabricated in-house and has successfully demonstrated its functionality in first characterization measurements. Building on this, a modular detector system tailored for this existing prototype array is now being developed, enabling X-ray spectroscopy experiments at different beamlines of the KIT Light Source.
A primary focus of our work lies in the mechanical and thermal integration of the detector into the cryogenic environment, aiming for continuous operation at temperatures below 50 mK. To maximize detection efficiency, we strive to position the detector as close as possible to the sample, which requires extending the module toward the beamline. This introduces a steep thermal gradient between the room-temperature sample and the cryogenic detector. To address this, we employ custom-designed thermal filters that block infrared radiation while allowing X-ray transmission across a wide photon energy range (from 100 eV to several tens of keV).
The detector is suspended within the cryostat using custom-designed mechanical supports that ensure thermal stability. Particular care was taken to thermally isolate the ultra-sensitive detector from warmer components such as the readout SQUIDs. While SQUIDs also benefit from low operating temperatures, they can introduce localized heating due to their resistive elements, which may degrade the performance of the MMC array. These efforts pave the way for the next stages of detector optimization and beamline implementation.
We present the current development status of the detector module, discuss recent integration results, and outline which steps will be taken next.

Speaker: Nik Arldt (Institute of Micro-and Nanoelectronic Systems, KIT; Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Germany)

Arldt_QUASY_Speedtalk.pptx

67 CRAFT – a Cryo-Cooler Based Test-Stand for the Study of Trapped Flux Dynamics in Superconducting Materials

When cooling down an ideal superconductor in an ambient magnetic field, the whole field is expelled according to the Meissner effect. In real superconductors, however, the ambient field is partially trapped in the material due to pinning centers like grain boundaries or impurities. This is called trapped magnetic flux. When applying electromagnetic radio-frequency (RF) fields, these trapped flux lines cause power dissipation in the material. This is particularly an issue in superconducting cavities for particle accelerators, as it reduces the energy efficiency and thus increases the demands on the cooling infrastructure. Therefore, understanding the dynamics of trapped magnetic flux and the underyling mechanism is of high interest. The influence of the material and cooldown conditions on trapped flux could provide valuable information for the optimization of material treatments and an efficient operation of superconducting cavities. For this purpose, a new test-stand named CRAFT (CRyo-cooler based Analysis of Flux Trapping) has been developed, being a successor of the liquid helium-based test-stand TraMaFluX. With the use of cryo-coolers it allows a considerably faster and more cost-efficient systematic characterization of trapped flux dynamics in rectangular superconducting samples. CRAFT enables an automation of the entire measurement procedure, allowing over 400 superconducting transitions to be performed per day without manpower.

In the following the structure of CRAFT is discussed and the measurement procedure of trapped flux is explained. Exemplary measurement data is shown and compared with data gained by the previous test-stand for the validation and characterization of CRAFT. It will be seen that the new test-stand does not only reproduce the previous data, but also expands the accessible parameter space. First measurement results and the arising possibilities by the automation of CRAFT are demonstrated.

Speaker: Alexander Cierpka (HZB)

68 Effects of Magnet Misalignments on Beam Dynamics at cSTART

The KIT cSTART project (compact STorage ring for Accelerator Research and Technology) aims to demonstrate injection and storage of high intensity ultra-short electron bunches into a large acceptance storage ring using the FLUTE linac and a laser plasma accelerator (LPA) as injectors.
Amongst the unique features of the cSTART project is the wide dynamic range of machine and beam parameters such as bunch charge, bunch length, beam energy etc. The comparably low energy electron beam (40-90 MeV) will not reach equilibrium in the 100 ms storage time due to the low amount of radiation damping at these energies.
In this contribution, we present simulation results regarding the impact of magnet misalignments, roll angles and field errors on beam dynamics as well as the performance of planned correction schemes.

Speaker: Patrick Schreiber (KIT)

69 Integrating Simulation-Based Inference and Real-Time Bayesian Workflows for Beam Diagnostics at COXINEL and DRACO

We present recent developments in applying Simulation-Based Inference (SBI) to electron beam characterization in the COXINEL beamline. Information-retrieval metrics were implemented to evaluate the informativeness of beam diagnostics, enabling quantitative comparison of single versus multiple beam imagers. Tests on both simulated and experimental datasets demonstrated that the SBI framework successfully captures the information content relevant to beam shape estimation.
To support large-scale inference tasks, we initiated the integration of the SBI workflow with HPC-based execution environments. This also includes iterative inference (sbi sequential rounds) after amortized training, addressing the larger computational demands of COXINEL beam propagation simulations based dataset compared to standard SBI .
To provide a pathway for integrating SBI into online optimization loops, real-time analysis, visualization, and manual control, a prototype of our ASAP::O-based data acquisition and streaming solution was deployed in the HZDR laser-acceleration laboratories. The setup includes a central ASAP::O server, producers running on experimental data acquisition PCs, and consumers on the HZDR HPC cluster. Current consumers enable human-in-the-loop Bayesian Optimization and automated data streaming into the openPMD format for offline analysis. Ongoing work focuses on incorporating experimental metadata into the ASAP::O streams in compliance with the HELPMI standard, facilitating standardized data management and interoperability across experiments.

Speaker: Ankush Checkervarty (Helmholtz-Zentrum Dresden-Rossendorf)

70 Burst-Mode CoRDIA – An Option for a Second-Generation Detector for the European XFEL

Burst-Mode CoRDIA is a modification to the CoRDIA detector. While
CoRDIA is intended for installation at PETRA IV, Burst-Mode CoRDIA aims
to fulfil the requirements for a 2nd generation camera at the European
XFEL.
The poster shows the modifications necessary, and compares the expected
performance to existing detectors, requirements and an even more advanced
(and expensive) option.

Speaker: Ulrich Trunk (FS-DS (Detektorsysteme))

71 Imaging goes Quantum - Quantum Machine Learning for Image Generation

Quantum generative models offer a promising approach for simulating complex phenomena in particle physics. The successful small prototype for calorimeter images with 8 qubits for 8 pixels is the Quantum Angle Generator (QAG), a variational quantum model trained with a Maximum Mean Discrepancy (MMD) loss to generate images from the probabilistic outputs of quantum circuits for calorimeter showers at the High-Luminosity LHC. The QAG can adapt through learning to hardware-induced noise, yielding stable, high-quality outputs with a factor of 20 less parameters than a comparable hybrid GAN.
Two new approaches to scale up to a larger number of pixels have been developed. One approach uses linear combinations of observables per pixel and succeeds with 6 qubits to generate signals in 25 pixels. The second new approach employs adaptive quantum polynomial chaos expansion with a Hermite basis generator and achieves with 13 qubits to generate images with 4096 pixels.

Speaker: Kerstin Borras (DESY and RWTH Aachen University)

72 The SIS100 laser cooling facility at FAIR

The heavy-ion synchrotron SIS100 is (at) the heart of the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It is designed to accelerate intense beams of heavy highly charged ions up to relativistic velocities and to deliver them to unique physics experiments, such as those planned by the APPA/SPARC collaboration. In order to cool these extreme ion beams, bunched beam laser cooling will be applied using a dedicated facility at the SIS100. We will use a novel 3-beam concept, where laser beams from three complementary laser systems (cw and pulsed) will be overlapped in space, time and energy to cover a very broad ion velocity range and thus maximize the cooling efficiency. We will present this project and give an update of its current status, including the laser and detector systems that will be used.

Speaker: Danyal Winters (GSI)

73 ANDESPix: A Digital SiPM for Scintillating Fiber Readout in Muon Detectors

High time resolution and granularity are becoming more and more important for particle detectors.
Driven by continuous advancement in CMOS Technology, new application specific integrated circuits (ASICs) are developed meeting the requirements for the new generations of particle detectors. Monolithic detectors having sensor and frontend electronics on one silicon die are becoming more widespread and facilitate integration in detector systems.
This work concentrates on ANDESPix, a digital silicon photomultiplier (SiPM) ASIC designed to readout scintillating fibers with low light intensity, as part of a muon detector, following the same muon detection principle used for muon detectors at the Pierre Auger Observatory and applied in the future ANDES Laboratory.
Thereby, photons should be detected with very high time resolution (<100 ps) in order to identify impinging muons and their time of arrival on the muon detector. In ANDESPix each single photon avalanche diode (SPAD) has its own digital readout containing a time-to-digital converter (TDC). The zero-suppressed digital readout allows to receive detailed timing and spatial information of incoming photons. This may lead to better understanding of their nature and increased detector efficiency, as e.g. improved fiber alignment to the SiPM.
ANDESPix is designed in 110 nm CMOS technology from LFoundry (LF11IS). This technology includes a SPAD cell for the wavelength range from 400nm to 850nm with high photon detection efficiency (PDE) and low dark count rate (DCR) developed by Fondazione Bruno Kessler (FBK).
Initial measurements have confirmed the general functionality of ANDESPix and results in the area of DCR and the characteristics of the TDC have already been collected.

Speaker: Alexander Elsenhans (KIT - IPE)

74 High-transmission soft x-ray spectroscopy detection systems for operando studies of applied material systems

Material and device development crucially depend on in-depth characterization of the electronic and chemical properties of the involved materials and their interfaces. Traditionally, (soft) x-ray spectros-copy techniques are very powerful and well-established tools for probing the electronic and chemical structure. Many instrumental advances have been achieved over the last decades, mostly focusing on high-resolution (and thus unavoidably low-transmission) instruments, which are particularly important for fundamental studies of well-defined systems. In contrast, the investigation of real-world devices requires highly sensitive (high-transmission) probes that are able to measure trace elements, minimize the x-ray dose to prevent beam-induced changes, and are ideally also applicable in an in situ/operando environment. Here, the key questions concern the chemical bonding present in the materials and how they react to changes in processing or operating conditions, making speed and sensitivity more relevant than ultimate energy resolution. In our efforts at KIT, we focus on developing x-ray spectroscopy techniques and the necessary experimental setups for this type of application, which has led to the de-velopment of the SALSA (Solid and Liquid Spectroscopic Analysis) experimental station, novel soft x-ray spectrometer concepts, as well as the X-SPEC beamline and its endstations at the KIT Light Source.
This presentation discusses the experimental setups, the methodological advances they enable, and the recent development of x-ray spectroscopy tools, in particular soft x-ray emission spectroscopy (XES) and resonant inelastic (soft) x-ray scattering (RIXS), for applied materials research. Through deliberate optimization of the parameters and controls of undulator light source, monochromators, focusing op-tics, as well as novel x-ray spectrometer designs, a unique detection system for XES and RIXS has been realized. This detection system enables rapid collection of XES and RIXS (in rapid RIXS maps) with a performance improvement of roughly one order of magnitude compared to previous systems.

Speaker: Lothar Weinhardt (Karlsruhe Institute of Technology (KIT))

75 PM MAGNET DEVELOPMENT STATUS FOR BESSYII+

Permanent-Magnet (PM) magnets combine up to zero power consumption with highly stable magnet operation without ripple and cooling vibration effects for more energy-efficient and stable accelerator operation.
As part of the upgrade program BESSYII+, we will install the B2PT dipole triplet as the first PM-based accelerator magnet. It concludes the BESSYII transfer line, transporting the electron beam from the booster to the storage ring and bends the beam into the injection septum of the BESSYII storage ring.
The new B2PT is planned with three PM hybrid dipole units of 300 mm length each to substitute the present power-hungry 1-m long electromagnet. The triplet produces a stable magnetic field that can be trimmed during operation by electro-correctors in the outer magnets. The permanent magnetic field reduces injection noise into the storage ring and shrinks the total power consumption by almost 30 kW. First mechanical and magnetic tests of an individual dipole unit have been carried out and the option to Implement thermal shims for temperature stability of the magnetic field is under consideration.
This poster reviews simulated beam bending optimization of the B2PT PM triplet and its assembly process opening up to PM magnet development also required for the preparation of the future 4th-gen low-emittance source BESSYIII.

Speaker: Dr Ilia Asparuhov (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH)

76 A Roadmap towards Direct Imaging of Plasma Targets during Laser Acceleration using Computation X-Ray Holography

Accurate, non-invasive density diagnostics of laser-driven targets are essential for optimizing high-intensity experiments in laser-plasma acceleration (LPA) and inertial-confinement fusion (ICF). We apply a computational X-ray imaging workflow based on single-shot, in-line coherent holography that records diffraction patterns with strong phase contrast and reconstructs spatial phase, and thus density, from intensity-only data. The inverse problem is addressed with differentiable optical propagators and machine-learning-assisted phase retrieval that incorporate physical priors to recover fine-scale structure.

As a proof of concept, we present reconstructions of laser-irradiated hydrogen gas jets, resolving hydrodynamic features relevant to plasma tailoring and injection control. The workflow is compatible with both external light sources and compact plasma-based X-ray sources, supporting feedback-oriented operation on LPA platforms.

We also outline an application to ICF: XFEL-based coherent diffraction imaging of shock-compressed solid hydrogen. At the European XFEL’s HED-HIBEF instrument, the approach targets resolving fuel-compression dynamics from ~20 µm down to sub-micron scales, addressing a central diagnostic need for high-gain implosion studies. Together, these results position computational X-ray holography as a versatile, physics-informed diagnostic bridging matter studies and enabling technologies across LPA and ICF.

Speaker: Jeffrey Kelling (HZDR)

77 First Electron Beams from the High-Average-Power Laser-Plasma Accelerator KALDERA

Laser-plasma acceleration (LPA) is a promising technology for future compact accelerators. However, the low repetition rate (typically few Hz) of today’s high-power laser systems prevents reaching the average power required by applications and hinders the implementation of fast feedback systems to mitigate beam instabilities. To this end, DESY has established a dedicated research program on high-average-power LPA. Our flagship project KALDERA pursues the development of a new laser tailored to plasma acceleration. Based on Ti:Sa technology, the system will deliver pulses at 100 TW peak power at up to 1 kHz repetition rate and by that enable the application of active stabilisation techniques to enhance LPA performance. Here, we report on the development and commissioning of MAGMA, the first LPA powered by KALDERA. We present first results on electron injection and acceleration to around 100 MeV at a repetition rate of 100 Hz, reaching into previously uncharted LPA territory.

Speaker: Luisa Niggemeier (MPL (Plasmabeschleuniger und Laser))

78 The all optical high energy X-rays experiment at DESY

The All oPtical High Energy X-rays (APHEX) experiment at DESY promises to deliver Inverse Compton Scattering (ICS) bright X-ray beams with narrow bandwidth and tunable energy. Such a compact X-ray source is a great alternative to large-scale synchrotron, potentially leading to a number of novel medical and industrial applications. However, all-optical ICS sources are yet to demonstrate percent-level bandwidths, a fundamental requirement for many applications. Here, we show how an active plasma lens and the tailoring of the scattering beam with a flying focus can be employed to finely tune the electron beam-photon interaction, producing tunable X-ray and gamma beams with percent-level bandwidths. The current state of APHEX and first results will also be discussed along with potential applications for this unique source.

Speaker: Lorenzo Martelli (MPA4)

79 High-Energy Cryogenic Yb:YLF Lasers for Matter, Technology, and Fusion Applications

Cryogenically cooled Yb:YLF lasers provide a promising path toward high-energy, high-average-power laser systems with excellent beam quality and efficiency. At DESY, we are developing next-generation cryogenic Yb:YLF lasers that combine advanced crystal-to-metal bonding, efficient cryogenic cooling, and numerical modeling of gain dynamics and thermal effects. The systems are being scaled to deliver several hundred millijoules per pulse at sub-picosecond durations and hundreds of watts average power. These developments are particularly relevant for high-energy-density matter research, laser-driven particle acceleration, and inertial fusion energy (IFE) concepts. Owing to its broad tunability and favorable thermo-optical properties, Yb:YLF represents a key material for future high-repetition-rate laser drivers in both scientific and fusion-related applications within the Helmholtz community.

Speaker: Mikhail Pergament (Deutsches Elektronen Synchrotron (DESY))

80 Monolithic Active Pixel Sensors for Tracking in Heavy-Ion and Nuclear Physics

Monolithic Active Pixel Sensors (MAPS) have become a cornerstone technology for precision tracking in heavy-ion and nuclear physics experiments. This poster presents an overview of the ITS3 upgrade for ALICE, featuring the world’s first wafer-scale, ultra-thin, and bent MAPS. The stitching process used to produce large-area sensors is introduced, along with the concept of the Monolithic Stitched Sensor (MOSS), which is composed of multiple Repeated Sensor Units (RSUs). The poster also includes results from sensor characterization, such as detection efficiency and fake hit rate versus threshold, as well as material budget measurements, demonstrating sensitivity down to 15 µm aluminum equivalent. Finally, an outlook is given on ALICE 3, where GSI is already actively contributing to the development of the next generation of MAPS-based tracking detectors.

Speaker: Simon Gross-Boelting (GSI)

81 Time-resolved measurements of transverse beam excitation in an electron storage ring

In the Karlsruhe Research Accelerator (KARA), electron beams of up to 200 mA are stored with an energy of 2.5 GeV, while injection is performed at 500 MeV. At the injection energy, the beam life time and the injection efficiency depend largely on Touschek scattering. As a counter-measure, the beam size can be enlarged transversally by an exciting modulation, e.g. applied via a strip-line. In an existing setup, the vertical beam size is measured with a double-slit interferometer. Here, we examine different detectors for this setup. A different choice from the conventional CMOS camera is the ultra-fast line camera KALYPSO, which can not only measure on a turn-by-turn basis, but can also stream frames to a computer and thus can capture larger time frames than for example a fast-gated camera.

Speaker: Marvin Noll (KIT)

82 OPOSSUM - An Open-Source Tool for Holistic Modeling of High-Energy, High-Intensity Laser Systems

The THRILL (Technology for High-Repetition-rate Intense Laser Laboratories) project develops technologies for future laser facilities at European Analytical Research Infrastructures (ARIs)[1]. Its main research areas are increasing the repetition rate of high-energy amplifiers, optimizing beam transport and stabilization of large-aperture/high-energy beams, developing large-area optical coatings, and providing designs for new laser facilities such as Eu-XFEL and FAIR.

With the increasing size and complexity of modern laser architectures, final designs require a holistic approach, as couplings between subsystems are significant and nonlinear. To address this, OPOSSUM – the Open-Source Optics Simulation System and Unified Modeler – has been developed within THRILL to support, guide, and evaluate different design approaches. Its objective is to provide a common software platform for the holistic simulation of large-scale optical systems, enabling co-development of the facility alongside its “digital twin.”

With OPOSSUM we aim to facilitate optical system setup through a node-based construction approach, mimicking laboratory assembly. Once defined, a system can be analyzed using various modeling methods without redefining it across multiple tools. To leverage existing expertise, an essential building block of OPOSSUM is the integration of already established modeling codes.

In this contribution, we present the current status of the OPOSSUM project, its modeling capabilities, and future development plans.

Speaker: Yannik Zobus (GSI Helmholtzzenztrum für Schwerionenforschung GmbH)

83 Towards improved control of laser-wakefield accelerators with multidimensional parameter scans

The quality of electron beams generated by laser–wakefield accelerators (LWFAs) has advanced to the point where they can drive novel light sources such as free-electron lasers (FELs), as demonstrated at several facilities. However, electron beam fluctuations remain a major challenge, driven by the nonlinear dynamics of injection, cavity formation, and laser propagation. These challenges become even more severe when targeting FELs with higher brightness and shorter wavelengths.
We present an in-depth simulation study in which we reconstruct an experimental LWFA setup using self-truncated ionization injection (STII) as the injection mechanism. Realistic three-dimensional particle-in-cell (PIC) simulations with PIConGPU, combined with the automated workflow engine Snakemake, enable a systematic exploration of the parameter space. Based on this reconstruction, we generate a multidimensional map linking electron beam properties to laser and plasma parameters. From this analysis, we derive requirements for laser and plasma configurations to achieve a controlled onset and truncation of the injection process. In addition, we investigate the impact of laser dispersion and focusing on the spectral and longitudinal charge distribution in the STII regime.

Speaker: Jessica Tiebel (HZDR)

84 Validation of the SiPM-on-Tile Readout Chain for the CMS High Granularity Calorimeter

For the upcoming high-luminosity LHC, the endcap calorimeters of the CMS experiment will be replaced by the high-granularity calorimeter (HGCAL), a sampling calorimeter using silicon sensors in the front and plastic scintillators read out by SiPMs in the back. After successfully integrating the SiPM-on-Tile sensors with the Serenity back-end hardware, we have conducted detailed
system tests to validate the functionality and performance of the readout chain. In this contribution, we will describe our system validation setup and showcase results from bench-top tests and beam tests.

Speaker: Fabian Hummer (KIT - IPE)

85 Experimental and Simulation Studies of High-Charge Electron Generation in the Self-Modulated Laser Wakefield Acceleration Regime at PHELIX

X-ray sources are of growing importance as a diagnostic tool for High Energy Density (HED) experiments and Inertial Confinement Fusion (ICF) studies as well as the upcoming FAIR facility in Darmstadt. For these applications, so-called x-ray backlighters must meet requirements regarding low divergence, small source size to achieve a sufficient imaging resolution and high brightness to overcome x-ray self-emission from the plasma itself. X-ray sources from laser-driven electrons from the regime of self-modulated laser wakefield acceleration (SM-LWFA) show promising parameters to meet these requirements, which can be achieved by using gas targets and picosecond laser pulses provided by the PHELIX laser system.
The poster contains the results of the commissioning experiment on electron acceleration in this regime, where Helium gas targets with backing pressures up to 100 bar were used, yielding target densities up to 1e19 cm-3 with lengths up to 4 mm. Using laser pulses of 500 fs with energies up to 110 J on-target, resulting in intensities of up to 1.5e19 W/cm^2, electron beams with a maximum bunch charge of 500 nC, an exponentially decaying spectrum up to 380 MeV, and divergences ranging from 70 to 230 mrad were achieved.
Additionally, a brief outlook on the follow-up experiment in 2026, which will focus on the generation and characterization of X-ray and gamma-ray emission from betatron radiation, inverse Compton scattering and bremsstrahlung, is given. Both experiments will be backed and compared to 3D-PIC simulations using WarpX in order to optimize the electron and subsequent x-ray yield.

Speaker: Victor Winter (Technical University of Darmstadt)

86 The influence of flashlamp water cooling on long-term aberrations in large aperture Nd:glass amplifiers

High-power laser systems are used worldwide to study light–matter interactions. However, high-repetition-rate, high-energy laser systems remain scarce because they require large optical components whose cooling presents a major challenge. To address this, an actively cooled Nd:glass slab amplifier with a large aperture (>30 cm) is being developed as part of the THRILL project (Technology for High-Repetition-Rate Intense Laser Laboratories). The development focuses on two critical aspects: the thermal isolation and active cooling of the Nd:glass slabs and their surroundings.

To investigate thermal isolation, a specially designed amplifier enclosure integrates the flashlamps into a water-cooled container. With this setup, the recovery time from long-term aberrations after optical pumping is reduced from 90 minutes to 5–10 minutes, compared to conventional nitrogen-flushed systems operated at GSI’s PHELIX laser, albeit with an approximately 30 % lower Nd:glass pumping efficiency.

This poster presents the experimental setup, performance trade-offs, and future design strategies, offering insights into the optimization of high-repetition-rate laser systems.

Speaker: Martin Metternich (GSI)

87 Utilization of renewable energies for sustainable accelerator operation at KIT

Significant energy is used for cooling the accelerator and infrastructure.
To save energy we installed a thermal well system to replace two of
three cooling machines in the future.

Speaker: Julian Gethmann (KIT)

Bus Transfer

If you booked a transfer, a bus will pick you up in the morning and bring you back after the end of the program.

Tuesday 4 November

Bus Transfer

If you booked a transfer, a bus will pick you up in the morning and bring you back after the end of the program.

Stream 1: ARD morning session

Convener: Hans Weise (DESY MSL (Supraleitende Beschleuniger Technologie))

88 Status and Strategy – ST1 Advance CW SRF-Systems

Speaker: Jens Knobloch (Helmholtz-Zentrum Berlin + Universität Siegen)

2025-11-04-MT-Tage11-ARD-ST1-Overview+Strategy-JK-final.pdf

89 Simulation-based optimization of the injection of ultrashort non-Gaussian electron beams into a storage ring

Speaker: Jens Schäfer (KIT IBPT)

MT_Presentation_JS.pptx

90 Efficient high energy and high-repetition-rate proton acceleration from cryogenic hydrogen foil targets

Speaker: Martin Rehwald (Eur.GPEX)

Rehwald_MTmeeting2025_public_version.pdf

91 Status and Strategy – ST2 New Concepts and Prototypes for Maximizing the Performance of Hadron & Electron Accelerators

Speaker: Peter Spiller (GSI)

92 Sub-fs SRF cavity control at DESY and HZDR

Speaker: Matthias Hoffmann (MSK (Strahlkontrollen))

Sub-fs SRF cavity control at DESY and HZDR - MHoffmann - 11th Annual MT Meeting 2025.pdf

Stream 2: DMA Morning Session

93 Status of DMA ST1

Speaker: Dr Kilian Schwarz (IT (IT Scientific Computing))

ST1-status-041125.pdf

94 Foundational Models in physics and its neighborhood

Speaker: Peter Steinbach (HZDR)

251104-fm-mt-annual-Steinbach.pdf

95 Trust me, I don't know - on uncertainties in machine learning predictions

Speaker: Steve Schmerler (HZDR)

main.pdf

96 Closing the Loop between Simulation and Experiment in Plasma and Photon Science

Laser–plasma interactions (LPI) are at the center of key future technologies where the extreme electro-magnetic fields of high-power lasers accelerate particles at mm-length scales. These include inertial confinement fusion, where laser fields compress fusion fuel to extract energy. Furthermore, laser–particle acceleration (LPA), where, e.g., electrons can be accelerated to GeV energies in a lab instead of by a km-long linear accelerator, can drive compact secondary radiation sources for high-resolution imaging in materials science or precise high-dose irradiation in medicine. These non-linear acceleration processes are highly sensitive to initial conditions, hence our goal of controlling them poses three major challenges: (1) Direct observation of the microscopic dynamics is infeasible in experiments, (2) high-fidelity large-scale plasma simulations, required to understand the microscopic particle dynamics, are prohibitively expensive for large parameter scans and produce PBs of field and particle data, and (3) uncertainty about experimental input parameters and microscopic outputs block the alignment of simulation campaigns with experiments.

This presentation shows how we enlist generative AI including physics-informed training, large-scale coupled simulation and training workflows, and probabilistic modeling to bridge this divide between experiment and simulation to address these three challenges.

Speaker: Jeffrey Kelling (HZDR)

mtDMA_kelling_2509.pdf

97 Building a Federated Data Landscape – Insights from the PaN Use Case

On behalf of DMA-ST1, we will present our vision towards a federated data and analysis infrastructure as seen from the Photon and Neutron science community. That is a large and diverse community with many users accessing LKII infrastructures. This diversity in both users and facilities impedes streamlined data management, as it is realized e.g. in particle/collider physics or astronomy. We have identified where a federated approach -- providing a homogeneous experience for users -- can be realized. Included are data and metadata sources at the user and the facility side, software and ressources needed for analysis, as well as data respositories, catalogues and search portals.

Speaker: Hans-Peter Schlenvoigt (Helmholtz-Zentrum Dresden – Rossendorf)

MT-DMA-ST1.pptx

Stream 3: DTS Morning session

98 Silicon pixel detectors for Relativistic Heavy Ion Physics, the present, the future and some dreams.

Originally developed for heavy-ion experiments such as STAR, CBM, and future Higgs factories, depleted CMOS Monolithic Active Pixel Sensors (DMAPS) have evolved into a competitive pixel detector technology. They combine an ultra-light material budget and exceptional spatial resolution with vastly improved radiation tolerance and rate capability. The technological advancements of the sensors themselves have been complemented by groundbreaking innovations in sensor integration, particularly driven by the ALICE collaboration. This presentation will provide an overview of the current DMAPS technologies. More importantly, it will introduce some potentially transformative innovations being explored within the newly established Detector Research and Development (DRD) communities, highlight their relevance for the design of next-generation silicon tracking detectors, and showcase the contributions of various Helmholtz Centers to this progress.

Speaker: Michael Deveaux (GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)

Silicon Pixels for HI physics.pptx

99 Advancing Monolithic Active Pixel Sensor (MAPS) Technology: From ALICE ITS3 to the Future ALICE 3 Detector

The ALICE Collaboration is preparing for two major detector upgrades that will push the boundaries of silicon tracking. Following the LHC Long Shutdown 3 (2026-2030), the three innermost layers of the Inner Tracking System will be replaced with a novel, bent, ultra-light MAPS-based tracker: the ITS3. Six wafer-scale sensors, produced in a 65 nm CMOS process, will be thinned and bent into cylinders with radii as small as 19 mm. These sensors will be supported only by low-density carbon foam, leaving no additional material in the active region. This design achieves a record material budget of below 0.09% x/X₀ per layer. Large-area seamless sensors up to 26×10 cm² will be realized by stitching, with integrated power and signal distribution that removes the need for flexible printed circuits on the sensors and drastically reduces passive material. Looking further ahead (2036+), the Collaboration has proposed ALICE 3, a completely new apparatus designed to open novel avenues for studying the quark-gluon plasma and explore a wide range of QCD physics and beyond. The experiment will heavily rely on silicon-based technologies and will be built as an ultra-low-mass, high-performance tracker covering eight units of pseudorapidity. It will combine excellent pointing resolution, advanced particle identification, and high-speed readout using state-of-the-art technologies and innovative detection concepts. The heart of ALICE3 will house a MAPS monolith spanning an area of about 60 m². It builds directly on the developments pioneered for the ALICE ITS upgrade and ITS3. The innermost three layers, forming the Vertex Detector, will consist of wafer-scale bent sensors mounted on a retractable structure inside the beam pipe. With their close proximity to the interaction point, the secondary vacuum, and an unprecedentedly low material budget, it will deliver a track-pointing resolution better than 10 µm for particles with pT > 200 MeV/c. Surrounding this will be the Outer Tracker, six times larger than the present ITS2, posing major challenges in large-scale chip testing, module assembly, and integration of large-pitch sensors to avoid a very high channel density. This contribution will summarize the key R&D advances of ITS3, including stitched sensor development, thinning, bending, radiation hardness, and air-cooling, and outline how these achievements pave the way for the ambitious ALICE 3 detector. Here, the presentation will outline the core design concepts and the efforts in sensor development, mechanical integration, and modularisation, leading up to the Technical Design Report expected in 2026.

Speaker: Bogdan Blidaru (Heidelberg University / GSI Helmholtzzentrum für Schwerionenforschung GmbH)

MT_nov25_blidaru.pdf

100 ASIC Challenges in High Energy Physics and Opportunities for Helmholtz

Speaker: Frank Simon (KIT IPE)

ASICs_in_HE_MT_2025_11.pdf

101 Characterization of an Enhanced Lateral Drift (ELAD) Sensor Prototype

Speaker: Judith Schlaadt (HH_FH_ATL_SD (Silicon Detectors))

2025-MT-Meeting-ELAD.pdf

102 Development of Ultra-broadband Direct THz Detectors based on Schottky diodes and AlGaAs/GaAs FETs for Longitudinal Beam Diagnostics

Many currently operating and future FELs can generate broadband radiation at MHz repetition rates, requiring a fast diagnostic tool (response time at least on a single-digit ns scale), ultra-broadband, & robustness. We develop ultrafast-operating THz detectors based on Schottky diodes and field-effect transistors (FET) operating at room temperature.
We present four critical features of our newly developed detectors:(1) frequency coverage: ultra-broadband single-pixel THz detectors (based on both technologies) covering 0.05 to 54.8 THz, which essentially covers full operational spectral range of the ELBE facility in Dresden-Rossendorf, Germany, (2) ultra-wide band IF bandwidth up to ~50 GHz: this enables single shot detection of ps-scale THz pulses with response time in ps range (overcome the pile up issue faced by its counterparts), (3) bunch compression monitoring capability from single-digit pC to ~220 pC: this is essential for precise machine settings for desired beam parameter output, and (4) Radiation hardness examination of the developed detectors for their smooth operation at accelerator facilities. These detectors can be implemented at other accelerators and FEL facilities.

Speaker: Rahul Yadav (Terahertz Devices and Systems, IMP , TU Darmstadt)

RY_MT_meeting_DTS_Nov25_Final.pdf

103 4D Particle Tracking with LGAD Strip Sensors and the DOGMA Readout System

LGAD sensors are revolutionizing particle detection technology by enabling simultaneous, precise measurements of both position and time. These capabilities open the way to advanced 4D tracking systems designed for operation under high-intensity conditions. In this presentation, we will introduce a 4D system based on LGAD strip sensors coupled to dedicated amplifiers and read out using the DOGMA system. A major advantage of this approach is its ability to operate at room temperature, eliminating the need for specialized cooling infrastructure. The system demonstrates excellent performance, achieving a time resolution below 70 ps, position resolution better than 15 μm, and rate capability in the MHz-per-channel range.

Speaker: Yevhen Kozymka (TU Darmstadt)

MT_Meeting_Kozymka.pdf

MT_Meeting_Kozymka.pptx

10:45 Coffee/ Tea

Stream 1: ARD late morning session

Convener: Andreas Jankowiak (HZB)

104 Status and Strategy – ST3 Advanced Beam Control, Diagnostics and Dynamics

Speakers: Dr Erik Bruendermann (KIT), Florian Burkart (MIL (Injektoren und Linearbeschleuniger))

2025-11-04_MT_ARD_ST3_Highlights_Strategy_11th_MT_Days_out.pptx

105 Developments in proton therapy: FLASH and minibeams at the HZB cyclotron

Speaker: Andrea Denker (Helmholtz-Zentrum Berlin)

Denker.pdf

Denker.pptx

106 Status and Strategy – ST4 Ultra Compact, Novel Accelerators and their Applications

Speaker: Andreas Maier (MPL (Plasmabeschleuniger und Laser))

2025_ARD_ST4_Summary_20251104_reduced_size.pdf

107 UED demonstration experiment using HZDR SRF gun-II

Speakers: Anton Ryzhov (Helmoltz-Zentrum Dresden-Rossendorf), Raffael Niemczyk (Helmholtz-Zentrum Dresden-Rossendorf)

2025-11-04_MT_meeting_GSI_UED_Niemczyk.pptx

Stream 2: DMA Late morning session

108 DESY DMA ST3 Summary

This works summarizes what has been done in DESY for DMA ST3

Speaker: Annika Eichler (MSK (Strahlkontrollen))

20251104_Eichler_MT_DMA.pptx

20251104_Eichler_MT_DMA_upload.pptx

109 Computer Vision for Enhanced X-Ray Microscopy: From Denoising to 3D Reconstruction

Speaker: Anil Kumar Mysore Badarinarayana (HZB)

MT meeting - Anil Kumar.pptx

110 PIConGPU: Advancing Laser Plasma Accelerator Simulations at Exascale

Speaker: Richard Pausch (HZDR)

MT_DMA_2025_rpausch.pptx

111 Bridging Experiment and Simulation in multiple dimensions - simulation-based inference in practice

Speaker: Peter Steinbach (HZDR)

251104-sbi-mt-annual-Steinbach.pdf

Stream 3: DTS Late morning session

Convener: Christian J. Schmidt (GSI Helmholtzzentrum fuer Schwerionenforschung GmbH)

112 KATRIN++ concept and challenges

KATRIN is the world-leading experiment for direct measurement of the neutrino mass. At the end of the current experimental phase a sensitivity of 0.3 eV/c2 will be reached. Studies show, that an upgrade of the experimental setup is possible to drastical increase the resolution. The combination of an atomic Tritium source and a superconduction quantum sensor array the neutrino will enable the measurement of the mass spectrum. The presentation will introduce concept and challenge of KATRIN++, a central activity carried by the Helmholz programs MU and MT in the upcoming funding period.

Speaker: Sebastian Kempf (KIT)

25-11-04_Annual-MT-Meeting_KATRIN++.pdf

113 Adaption of metallic magnetic calorimeters to x-ray spectroscopy at ion storage ring experiments

Metallic magnetic calorimeters (MMC) for x-ray spectroscopy combine an excellent energy resolution comparable to crystal spectrometers with a broad bandwidth acceptance, thus providing new possibilities for precision measurement. At HI-Jena/GSI we have employed two MMCs each based on an 8x8 pixel array in a physics production run at the ion storage ring CRYRING@ESR. The digital readout of the systems was fully integrated into the heterogenous detector/sensor environment of the storage ring enabling to record coincidences between the MMC photon detectors and down charged ions as well as to synchronize the data accumulation with the operation mode of the storage ring. A record resolution for the detected photons of about 90 eV has been reached over a broad spectral range from 5 keV to above 100 keV. We will report on the details of this experiment as well as on ongoing activities.

Speaker: Günter Weber (Helmholtz Institute Jena)

MT_DTS_gweber.pptx

114 The new facility for High-resolution Superconducting Sensors (HSS)

Cryogenic superconducting sensors offer time and energy resolutions which exceed that of all available alternatives. The enormous potential of this frontier technology in a wealth of applications has been demonstrated and must now be exploited in science. HSS is a unique research, development and production facility for superconducting particle and radiation detectors at KIT. The installation is now complete and capabilities will be presented.

Speaker: Mathias Wegner (KIT)

MT25_DTS_Wegner_HSS.pptx

115 Constellation - a Flexible Control and Data Acquisition Framework for Beamlines and Beyond?

Speaker: Stephan Lachnit (DESY ATLAS)

2025-11-04_Constellation_11th_MT_Meeting.pdf

116 HGCAL SiPM-on-Tile Full-Stack Integration with the Serenity Phase-2 DAQ Hardware

For the upcoming high-luminosity LHC, the endcap calorimeters of the CMS experiment will be replaced by the high-granularity calorimeter (HGCAL). HGCAL is a sampling calorimeter using silicon sensors in the front and plastic scintillators read out by SiPMs in the rear. In this contribution we will present HGCAL's SiPM-on-Tile readout chain and discuss the steps that were neccessary to integrate the sensors with the Serenity back-end hardware. The successful commissioning of the readout chain enabled three important tests: First, the full per-series readout chain was tested in a particle beam while operating in a 3T magnetic field. Secondly, we have built and tested a stainless steel absorber stack instrumented with fifteen tile modules, with the goal to study the calorimetric and timing performance. And finally, we have built and tested a complete horizontal slice of scintillator tile modules for system tests of the readout chain.

Speaker: Fabian Hummer (KIT - IPE)

MT Talk v1.2.pdf

117 Advancing Ion Computed Tomography with an LGAD-based TOF imaging system

Ion computed tomography (iCT) is an imaging modality for the direct measurement of the relative stopping power (RSP) distribution inside the patient. While iCT could provide more accurate RSP maps compared to conventional x-ray CT, current systems still struggle to meet the clinical requirements, particularly keeping the image acquisition time under a few minutes. One solution is to build a so-called Time-of-Flight iCT (TOF-iCT) system based Low Gain Avalanche Diodes (LGADs), which are ultra fast silicon detectors with high spatial and temporal resolution. In this contribution we present a TOF-iCT system based on single-sided LGAD strip sensors (FBK) and a custom FPGA-based readout system developed at GSI. First imaging tests at MedAustron including a TOG-proton radiography of an aluminium stair phantom and a TOF-helium radiography of a mouse phantom are shown. We conclude with our roadmap towards a clincially viable LGAD-based TOF-iCT system.

Speaker: Felix Ulrich-Pur (Institute of high energy phyiscs (HEPHY) Vienna)

12:45 Lunch

MT executive board meeting (by invitation)

Group Photo

118 Orga team: information for Wednesday

MT_GSI_Tuesday4Nov.pdf

Plenary: Strategy II

119 Strategy DTS

Speakers: Frank Simon (KIT IPE), Heinz Graafsma (FS-DS (Detektorsysteme)), Silvia Masciocchi (GSI and Uni Heidelberg)

DTS_Strategy_Nov2025.pdf

120 Strategy DMA

Speakers: Michael Bussmann (CASUS / Helmholtz-Zentrum Dresden - Rossendorf), Philipp Neumann (IT (Informationstechnik))

MT-Annual-Meeting-DMA-Strategy.pptx

15:45 Coffee/ Tea

Plenary: Colloquium

121 Transverse Deflecting Structures (TDS) as a diagnostic tool

Accurate beam characterisation is essential to enhance the performance of X-ray free-electron lasers (XFELs). This talk presents recent advances in time-resolved diagnostics and phase-space reconstruction. At SwissFEL’s Athos beamline, attosecond-resolution measurements with a variable-polarization X-band TDS enabled full FEL power profile reconstructions with pulse durations down to 300 as. In addition, a new method for five-dimensional (5D) phase-space tomography, first demonstrated at FLASHForward and later applied at SwissFEL, provides detailed insight into the spatial and momentum distributions of GeV-class electron beams.

Speaker: Paolo Craievich (PSI)

20251104_talk_MT_Craievich.pdf

20251104_talk_MT_Craievich.pptx

122 Detectors for photon science at 4th generation light sources

Synchrotron facilities worldwide are undergoing major upgrades to next-generation sources, increasing their brilliance by more than one order of magnitude. This results in significantly higher photon flux on the sample—and consequently, much higher X-ray intensities on the detectors. Such conditions pose substantial challenges for detector technology, which must now sustain intensities several orders of magnitude beyond current capabilities.
To address this, new single-photon counting detectors with enhanced count-rate capabilities are being developed, employing novel counting architectures to achieve rates exceeding 10 million photons per pixel per second. For even higher intensities, charge-integrating detectors operating at multi-kilohertz frame rates are under active development. As experiments become faster and more efficient, time-resolved applications are gaining increasing interest, driving the need for detectors capable of frame rates above 10 kHz. At the same time, applications previously limited by low photon flux are now becoming feasible, motivating interest in detectors that can resolve single photons, offer energy discrimination, and potentially achieve super-resolution beyond the pixel pitch.
As time resolved experiments are gaining interest, fast large area detectors deliver enormous data throughput, and thus require innovative data-handling and processing solutions.
Moreover, the required detector technologies span a broad energy range—from a few hundred eV to several tens of keV—necessitating sensor developments beyond standard silicon. Promising developments include LGADs optimized for soft X-rays at low energies and high-Z compound semiconductors such as GaAs and CZT for higher energies.
The current transition to brighter light sources marks an exciting and challenging period for detector development in photon science, opening opportunities to explore new methods and technologies.

Speaker: Anna Bergamaschi (PSI)

GSI2025_Bergamaschi.pptx

Dinner

Bus Transfer

If you booked a transfer, a bus will pick you up in the morning and bring you back after the end of the program.

Wednesday 5 November

Bus Transfer

If you booked a transfer, a bus will pick you up in the morning and bring you back after the end of the program.

Stream 1: ARD Wednesday morning

Convener: Peter Spiller (GSI)

123 cSTART – compact storage ring for ultra-short bunches in non-equilibrium

Speaker: Matthias Fuchs

Fuchs_cSTART_final.pptx

124 Beam back @ FLASH

Speaker: Lucas Schaper (MFL (FLASH))

125 Simulations of the plasma injector for PETRA IV

Speaker: Sergey Antipov (MPY (Beschleunigerphysik))

MT_Meeting_05.11.2025.pdf

126 Status of the pulsed electron lens for space charge compensation at GSI

Speaker: Kathrin Schulte-Urlichs (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

MT_E-Lens_KSU_05112025_V2.pdf

MT_E-Lens_KSU_05112025_V2.pptx

127 Multilayer R&D for beyond Nb applications

Speaker: Lea Sophie Preece (DESY)

Multilayers_Preece.pdf

128 Reliable high-charge electron acceleration in the SM-LWFA regime enabled by high f-number focusing

Speaker: Johannes Hornung (Insitut für Kernphysik, Technische Universität Darmstadt)

MT-Meeting-JH.pptx

129 Status of Advanced Demonstrator project an futher developments on SRF Technology for HELIAC

Speaker: Maksym Miski-Oglu (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

HELIAC_v02.pptx

Stream 2: DMA Wednesday morning

130 Status of DMA ST2

Speakers: Guido Juckeland (Helmholtz-Zentrum Dresden-Rossendorf (HZDR)), Mohammad Al-Turany (GSI Helmholtzzentrum für Schwerionenforschung)

DMA_ST2_Nov25.pdf

131 AI-assisted code review

Speaker: Alexey Rybalchenko (GSI Darmstadt)

[MT11] AI-Assisted Code Review.pdf

132 Integrating JupiterHub service to the GSI HPC infrastructure

Speaker: Jeremy Wilkinson (GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt)

Deployment of Jupyterhub - M&T meeting.pdf

133 Design and Automation of a Soft X-ray Spectrometer Using Machine Learning

Speaker: Peter Feuer-Forson (HZB)

MT_PFF.pdf

134 Software Infrastructure for the fully containerized Cluster at GSI/FAIR

Speaker: Dmytro Kresan (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

Kresan-MT25.pdf

Stream 3: DTS Wednesday morning

Convener: Moritz Guthoff (DESY)

135 ECFA DRD 7.6b project - shared access to 3D integration

The DRD 7.6b project leverages in-house infrastructure and expertise across participating institutes to enable the fabrication of high-value prototypes, demonstrators, and test devices. By providing shared access to the community and ensuring the long-term availability of advanced 2.5D/3D integration technologies, the initiative fosters innovation and builds strong links with industrial partners. The project is establishing an international distributed detector infrastructure, where each institute contributes specialized technological processes to form a distributed production workflow. As a first step, a pilot project, a full-wafer engineering run entirely developed and fabricated in-house by DRD 7.6b contributors, has been launched. Operating under a clear, unified vision, the collaboration shares infrastructure and know-how to guarantee broad community access to cutting-edge integration technologies. Looking forward, DRD 7.6b will further strengthen synergies within the DRD7 community through joint design and production of silicon interposers, while remaining open to new partners and projects.

Speaker: Michele Caselle (KIT)

DRD7_6b_Caselle_MT_2025.pdf

136 Overview STS

Speaker: Christian J. Schmidt (GSI Helmholtzzentrum fuer Schwerionenforschung GmbH)

The CBM-Silicon Tracking System in Assembly-C.J.Schmidt.pptx

137 SciFi detectors development at GSI

The upcoming FAIR facility at GSI will host the Super-FRS, a high-resolution in-flight fragment separator designed to deliver radioactive ion beams for a wide range of experiments in nuclear physics and astrophysics. In this context, different Scintillating fiber-based trackers have been successfully developed. A production process for single layer fiber ribbons has been established. Scintillating fibers with square cross section are used to build ribbons with highest material budget homogeneity. The fiber ribbon is read out by one dimensional MPPC arrays coupled to custom developed readout electronics. The development of this detector concept is so promising that it is currently applied for three detector types within the Early Science Program of FAIR, namely R3B heavy ion tracking detectors and SuperFRS-SciFi as well as the R3B Proton Arm Spectrometer based in a multilayer modular concept. The first detector has already been commissioned and several prototypes have been tested proving the concept. By the end of 2026, the installation of nearly 14 Super-FRS-SciFi detectors along with the PAS is planned. The current status and outlook of these three detector development lines will be presented.

Speaker: Pablo Garcia Gil (GSI & University of Vigo)

MT2025PGarcia.pdf

MT2025PGarcia.pptx

138 High-pressure TPC as active target for nuclear and high-energy physics

The active target detector system ACTAF (ACtive TArget for FAIR) for applications in reaction studies with radioactive beams at small momentum transfer is a part of the R3B setup at FAIR. The design of the currently under construction detector inherited ideas from the active target set-up used in previous experiments at GSI but is heavily extended with respect to a larger variety of reactions and heavier beams up to uranium. Reactions like elastic proton scattering at intermediate energies, allow to precise determine the nuclear matter radii, and the radial shape of the nuclear matter distributions in these nuclei that are very basic nuclear characteristics important for nuclear structure theories and astrophysics. These experiments, among others, are not possible with any other method and anywhere else except of FAIR and thus, unique. This unique feather will be first used at CERN for an experiment measuring muon-proton elastic scattering for a determination of a proton radius. First time in the series of experiments aiming this, not only projectile but also recoil will be measured. The detector system is unusual in many aspects – absence of gas amplification, gas circulation and purification system, usage of FADC and pulse processing, Details of the operational principle, construction of the detector, its electronics and DAQ will be presented.

Speaker: Martin Poghosyan (GIS)

Active_target_nov2025.pdf

139 Soft X-ray detectors for synchrotrons and FELs

Soft X-rays have a variety of applications at synchrotrons and FELs. In particular, the photon energy of these sources can be tuned to element-specific excitations, and in the soft X-ray range this allows (for example) high sensitivity to the carbon atoms that form the backbone of biological structures, or to excitations in transition metals that are crucial to magnetism. However, soft X-rays are challenging to detect due to their very short absorption length and low signal per photon.
Firstly, we are developing the Percival CMOS imager for soft X-rays. This is a 2-megapixel detector aimed at achieving a high dynamic range, sensitivity to single photons down to 250 eV, and high frame rate of 300 Hz. This has been developed as a collaboration of multiple light sources (DESY, Elettra, Diamond, Pohang Accelerator Lab and Soleil) together with Rutherford Appleton Laboratory. Its soft X-ray performance relies on the combination of a multigain design for high dynamic range, and backside illumination with a thin entrance window for minimal insensitive thickness. Recently, a second generation of Percival has been developed. This has three key elements: a second-generation sensor that corrects problems with the first version, particularly nonuniformities and cross-talk; new DAQ hardware and firmware allowing operation close to the maximum frame rate and new features such as ROI; and an improved form factor and cooling to improve practical usability. The second-generation sensor and DAQ are now being tested in experiments at beamlines.
In addition, we have begun to collaborate with other institutes on developments of LGADs. By achieving a gain improvement of 10-20 compared to standard silicon photodiodes, LGADs could allow existing hybrid pixel detectors such as AGIPD to operate in the soft X-ray range. Firstly, inverse LGADs produced by Sintef are being bonded for testing with AGIPD chips. Secondly, we are collaborating with the Max Planck Semiconductor Laboratory, who are developing a novel LGAD design with a deep gain layer called MARTHA. This should allow 100% fill factor while minimizing the backside layer thickness and achieving consistent gain at different X-ray energies.

Speaker: David Pennicard (FS-DS (Elektronik und Data))

Pennicard-SoftXray_MT2025_v4.pdf

Pennicard-SoftXray_MT2025_v4.pptx

140 TEMPUS Detector: Recent Developments and Applications

Using the Timepix4 readout chip developed by the Medipix4 collaboration, we are developing TEMPUS (Timepix4-based Edgeless Multi-Purpose Sensor) as a next-generation detector for time-resolved measurements at the PETRA-III synchrotron and the planned PETRA-IV upgrade. The Timepix4 chip operates in two readout modes: a framing mode that improves on the Medipix3 chip capabilities, and a timestamping mode that improves on the Timepix3 chip performance. With 512 × 448 pixels at a 55 μm pitch, TEMPUS offers a larger sensitive area, a 10× higher count rate in photon-counting mode, and frame rates of up to 40 kHz.
The development of the TEMPUS detector focuses on the event-driven mode, where precise timing can be achieved at high rates. Timing resolution of a few nanoseconds has been demonstrated for TEMPUS versions with silicon p-on-n sensors of 300 μm and 500 μm thickness, while first tests with CdTe sensors enabled direct comparison of material-dependent timing and energy performance. The stability of the 16 GWT links—delivering over 80 Gbps aggregate bandwidth—has been significantly improved, enabling continuous high-rate operation. On the data analysis side, new clustering algorithms and an energy calibration pipeline have been introduced, enhancing both spatial resolution and quantitative energy response.
The TEMPUS detector has participated in beamtimes at PETRA III, ESRF, and Eu.XFEL. Applications under study include nuclear resonant scattering (NRS), X-ray photon correlation spectroscopy (XPCS), and experiments in parametric down-conversion. These initial results establish TEMPUS as a versatile detector platform capable of combining high-rate photon counting with nanosecond time resolution.

Speaker: Adriana Simancas (DESY)

MT_tempus_2025_upload.pdf

141 Radiation Damage Compensation in Diamond Sensors for Heavy-Ion T0 Detectors

Radiation damage in diamond sensors is one of the main challenges in experiments performed at high intensities. This issue is particularly relevant for T0 detectors used in heavy-ion research. To significantly extend the lifetime of T0 detectors, we proposed a dedicated amplifier system that compensates for radiation-induced degradation. In this presentation, we will introduce a working system based on a two-stage amplification scheme, connected to discriminators and TDCs implemented in FPGA. Test results demonstrate that the operational lifetime of the system can be extended by at least a factor of 170, while maintaining excellent performance: nearly 100% efficiency and time resolution below 50 ps.

Speaker: Jerzy Pietraszko (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

Rad_Damage_compensation_MT_11_2025_JPietraszko_.pdf

10:45 Coffee/ tea

Plenary: Closing plenary

142 Matter Competence Team "Technologies for fusion energy and frontiers of optics" (FEOPT)

Speakers: Malte Kaluza (Helmholtz-Institute Jena), Matthias Fuchs

FEOPT_MT-meeting_251105_MatthiasFuchs_MalteKaluza_final.pptx

143 Strategy IDAF

IDAF-Strategy-11annualMT-GSI-20251105.pdf

144 Commissioning results from the SRF photoinjector at SEALab

Speaker: Emily Brookes

Commissioning_results_from_the_SRF_photoinjector_at_SEALab.pptx

145 Closeout

MTCloseout_Jahrestreffen_2025_v3.pdf

12:45 opt. Lunch Break

Tours/Lab Visits

Meeting of Writing Team: PoF Proposal - by invitation

We will meet in an extended Managment Board MT with Topic speakers and roughly one representative per subtopic.

Bus Transfer

If you booked a transfer, a bus will pick you up in the morning and bring you back after the end of the program.

Thursday 6 November

Bus Transfer

If you booked a transfer, a bus will pick you up in the morning and bring you back after the end of the program.

Meeting of Writing Team: FEOPT

We will meet in an extended Managment Board MT with Topic speakers and roughly one representative per subtopic.

Meeting of Writing Team: PoF Proposal - ARD Group

We will meet in an extended Managment Board MT with Topic speakers and roughly one representative per subtopic.

Meeting of Writing Team: PoF Proposal - DTS Group

We will meet in an extended Managment Board MT with Topic speakers and roughly one representative per subtopic.