High average power, kHz laser plasma acceleration (LPA) is an emerging technique
which could supply few MeV, few femtoseconds electron bunches with high average
current. Such electron beams can be transformative for many industrial applications,
for ultrafast pump-probe studies as well as drivers for secondary sources. Tailoring
the plasma profile is an essential part, allowing to control...
We combine ab initio path integral Monte Carlo (PIMC) simulations with fixed ionic
configurations, obtained by DFT-MD simulations, in order to solve the electronic problem
for hydrogen under warm dense matter conditions. To solve the divergence problem in
the Ewald-sum for attractive potentials we employ the pair-approximation. This approach
is compared against the much simpler Kelbg...
Rayleigh scattering is the dominant contribution to the elastic scattering of hard X-rays on atoms for photon energies below 1 MeV. It is the scattering of a photon on atomic electrons without gain or loss of energy. The angular distribution of Rayleigh scattering strongly depends on the polarization of the
incident photon beam [1]. Thus, determining the angular distribution of Rayleigh...
Software as an important method and output of research should follow the RDA "FAIR for Research Software Principles". In practice, this means that research software, whether open, inner or closed source, should be published with rich metadata to enable FAIR4RS.
For research software practitioners, this currently often means to follow an arduous and mostly manual process of software...
Laser-plasma accelerators (LPA) are one the verge of becoming drivers for real-world science applications. However, in order to be considered serious alternatives to conventional machines they need to be able to provide competitive quality and versatility of the electron beam parameters as requested by potential applications. As shown by numerous experiments in the past LPAs are in principle...
Plasma accelerators promise to revolutionise many areas of accelerator science. However, one of the greatest challenges to their widespread adoption is the difficulty in the control and optimisation of the accelerator outputs due to coupling between input parameters and the dynamic evolution of the accelerating structure. Here, we use machine learning techniques to automate a 100 MeV-scale...
The heavy ion synchrotron SIS100 at the FAIR facility, which is currently built at the GSI Helmholtzzentrum in Darmstadt, will provide heavy ion beams of highest intensities, 5e11 Uranium particles per pulse. For FAIR operation, the existing heavy ion synchrotron SIS18 at GSI will be used as a booster synchrotron for SIS100. Four injections of 1.25e11 will be accumulated in SIS100 for further...
Two parallel, corrugated plates will be installed at the KIT storage ring KARA (KArlsruhe Research Accelerator). This impedance manipulation structure can be used to study and eventually control the electron beam dynamics and the emitted coherent synchrotron radiation (CSR) at KARA.
In this contribution, we present the design of the impedance manipulation structure with corrugated plates,...
When developing future accelerators the particle source is not the only challenge, but also the matching of particles is important. In this poster a new alternative to common matching devices will be presented, the tapered plasma lens.
As a first step a downscaled version of an already proposed plasma lens for the ILC positron source was designed. This process includes CFD simulations and...
Electro-optical (EO) methods are well-proven diagnostic tools, which are utilized to detect THz fields in countless experiments. The world’s first near-field EO sampling monitor at an electron storage ring was developed and installed at the KIT storage ring KARA (Karlsruhe Research Accelerator) and optimized to detect longitudinal bunch profiles. This experiment with other diagnostic...
Laser-plasma accelerators (LPAs) outperform current radiofrequency technology in acceleration strength by orders of magnitude. Yet, enabling them to deliver competitive beam quality for demanding applications, particularly in terms of energy spread and stability, remains a major challenge. Here, we report on a recently published method that combines bunch decompression and active plasma...
S-band RF-guns are highly developed for production of low emittance relativistic electron bunches, but need powerful klystrons for driving. Here, we present the design and first experimental tests of a compact S-band gun, which can accelerate electrons up to 180 keV powered by only 10 kW from a compact rack-mountable solid-state amplifier. A pin-cathode is used to enhance the RF electric field...
Cryogenic Current Comparators (CCC) are presently used at CERN-AD (100 mm beamline diameter) and in the FAIR project at CRYRING (150 mm beamline diameter) for non-destructive absolute measurement of beam currents in the range of below 10 μA (current resolution 10 nA). Both sensor versions (CERN-Nb-CCC and FAIR-Nb-CCC-XD) use niobium as superconductor for the DC-transformer and magnetically...
Few-cycle shadowgraphy is a valuable diagnostic for laser-plasma accelerators for obtaining insight into the $\mu$m- and fs-scale relativistic plasma dynamics. To enhance the understanding of experimental shadowgrams, we developed a synthetic shadowgram diagnostic within the fully relativistic particle-in-cell code PIConGPU.
In the shadowgraphy diagnostic, the probe laser is propagated...
Neutron research in Europe is mainly based on various nuclear reactors that will be successively decommissioned over the next years. This means that despite the commissioning of the European Spallation Source ESS, many neutron research centers, especially in the medium flux regime, will disappear. In response to this situation, the Jülich Center for Neutron Science (JCNS) has begun the...
HELIPORT is a data management solution that aims at making the components and steps of the entire research experiment's life cycle discoverable, accessible, interoperable and reusable according to the FAIR principles.
Among other information, HELIPORT integrates documentation, scientific workflows, and the final publication of the research results - all via already established solutions for...
Helmholtz Imaging's mission is to unlock the potential of imaging in the Helmholtz Association. Image data provide a substantial part of data being generated in scientific research. Helmholtz Imaging is the overarching platform to better leverage and make accessible to everyone the innovative modalities, methodological richness, outstanding expertise and data treasures of the Helmholtz...
Mu3e is going to search for the lepton-flavor violating decay of a positive muon into two positrons and an electron. This decay is possible within the Standard Model, but it is suppressed to O(1050). However, there is a number of suggested extensions of the Standard Model, introducing particles that render this decay path much more likely. Therefore, any observation of this decay would be...
Current noisy intermediate-scale quantum devices suffer from various sources of intrinsic quantum noise. Overcoming the effects of noise is a major challenge, for which different error mitigation and error correction techniques have been proposed.
In this paper, we conduct a first study of the performance of quantum Generative Adversarial Networks (qGANs) in the presence of different types...
Beam-driven plasma-wakefield acceleration has the potential to reduce the building cost of accelerator facilities, with large accelerating fields that are orders of magnitude greater than those of radio-frequency cavities. Sustaining strong decelerating fields for the driver and strong accelerating fields for the trailing bunch across long plasma stages will be key to demonstrating high energy...
The heavy-ion synchrotron SIS100 is the core machine of the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It is capable of accelerating a large range of ions, produced by the injector (the upgraded GSI facility), up to highly relativistic velocities and extracting them for unique experiments, e.g. APPA/SPARC. In order to cool such intense beams of relativistic heavy...
Reinforcement learning (RL) has enabled the development of intelligent controllers for complex tasks that previously required human intuition to solve. In the context of particle accelerators, there exist many such tasks and solving them with conventional methods takes away from scarce experiment time and limits the operability of accelerators. We demonstrate how to successfully apply RL to...
At the KARA accelerator, after the electron bunches are per-accelerated by a 3 GHz microtron, a booster synchrotron operating at 500 MHz is used to increase the energy of the electrons from 50 MeV to 500 MeV, before they are injected into the storage ring. Due to various effects, the injection efficiency from to the ring is rather low. To investigate these inefficiencies and remedy them, fast...
MALTA is a depleted monolithic active pixel sensor developed in the Tower 180 nm CMOS imaging process. Monolithic CMOS sensors offer advantages over current hybrid imaging sensors both in terms of increased tracking performance due to lower material budget but also in terms of ease of integration and construction costs due to the integration of read-out and active sensor into one chip. Current...
Magnetic microcalorimeters (MMCs) are energy dispersive, low-temperature particle detectors that combine an intrinsically fast signal rise time, an excellent energy resolution, a huge dynamic range, a quantum efficiency close to 100% as well as an almost ideal linear response. For these reasons, MMCs are nowadays actively used in a wide field of applications. But although microfabrication...
The German National Research Data Infrastructur (Nationale Forschungsdaten-Infrastruktur, NFDI e.V.) was founded to promote open data in the german research system under consideration of the FAIR principles ("findable, accessible, interoperable and reusable”). The implementation is performed in consortia which represent different areas in science. At DESY, we house two NFDI consortia:...
Groundbreaking experiments such as QUBIC, which seeks to measure the Cosmic Microwave Background (CMB) radiation, employ highly sensitive superconducting detectors thanks to its very low noise contribution. To readout these detectors, complex cryogenic circuits which involves rf-SQUIDs coupled to microwave resonators and make use of frequency multiplexing technique in order to transmit...
Progress in experimental physics relies often on advances and breakthroughs in instrumentation, leading to substantial improvements in measurement accuracy, efficiency, and speed, or even opening completely innovative approaches and methods. Such experiments push the requirements for sensors technologies in several characteristics like tracking precision, timing, material budget, radiation...
This poster presents openPMD, an open and F.A.I.R. standard for particle-mesh data, and its impact in heterogeneous scientific workflows.
Particle accelerator codes need to span various time and length scales, leading to data processing pipelines consisting of multiple heterogeneous codes.
Standardization of physical data helps bridging the different models with a commonly-understood markup,...
The alpaka library is a header-only C++17 abstraction library for development across hardware accelerators (CPUs, GPUs, FPGAs). Its aim is to provide performance portability across accelerators through the abstraction (not hiding!) of the underlying levels of parallelism. In this poster we will show the concepts behind alpaka, how it is mapped to the various underlying hardware models, and...
PIConGPU’s latest release 0.6.0 in December 2021 brought a number of new features. Among these are an arbitrary-order Maxwell solver, the Higuera-Cary pusher, collisions, and incident field generation via the total field/scattered field technique enhancing its numerical stability and predictive capabilities.
Furthermore, there are various technical advances, most notably support of the HIP...
We report on our latest developments of a planar fiber-chip-coupling scheme, using angle polished, polarization maintaining (PM) fibers. Most integrated photonic chip components are polarization sensitive and a suitable way to launch several wavelength channels to the chip with the same polarization is the use of PM fibers. Those impose several challenges at processing and handling to achieve...
In recent years, Laser Plasma Acceleration (LPA) has become a promising alternative to conventional RF accelerators. However, so far, it has only been theoretically shown that generating polarized LPA beams is possible. The LEAP
(Laser Electron Acceleration with Polarization) project at DESY aims to demonstrate this experimentally for the first time, using a pre-polarized plasma target.
The...
Recent developments regarding metallic magnetic calorimeters (MMCs) have resulted in a new class of detectors for precision X-ray spectroscopy, for example the maXs series of detectors [1] (cryogenic microcalorimeter arrays for high resolution X-ray spectroscopy), which have been developed within the SPARC collaboration. These detectors are based on the following measurement principle: The...
The FAIR complex at the GSI Helmholtzzentrum will generate heavy ion beams of ultimate intensities. To achieve this goal, low charge states have to be used. However, the probability for charge exchange in collision with residual gas particles of such ions is much higher than for higher charge states. In order to lower the residual gas density to extreme high vacuum conditions, 65% of the...
We have implemented a system for fully real-time data processing during a serial X-ray diffraction experiment, with (in principle) no need to store image data on disk. Using the CrystFEL software in combination with the ASAP::O data framework, frames from a 16 megapixel Dectris EIGER2 X detector were searched for peaks, indexed and integrated at the maximum full-frame readout speed of 133...
QUBIC ("Q & U Bolometric Interferometer for Cosmology") is a project which focuses on studying vestiges of gravitational waves from the B-polarization mode present in the Cosmic Microwave Background, a product of the Big-Bang. The required sensitivity of the polarization temperature anisotropies of the CMB requires around 2048 ultra-sensitive detectors working at cryogenic temperatures. The...
The matter-antimatter asymmetry might be understood by investigating the EDM (Electric Dipole Moment) of elementary charged particles. A permanent EDM of a subatomic particle violates time reversal and parity symmetry at the same time and would be, with the currently achievable experimental accuracy, an indication for further CP violation than established in the Standard Model.
The...
A superconducting helical undulator is not only very compact but also more effective in terms of synchrotron radiation production and free-electron laser (FEL) amplification compared to other undulator geometries. Furthermore, the superconductor is used very efficiently in a helical geometry with respect to the undulator field generation and the produced circular polarized photons are suitable...
The production of low emittance positron beams for future linear and circular lepton colliders, like CLIC or FCC-ee, requires high-field damping wigglers. Just as compact free-electron lasers (FELs) require high-field but as well short-period undulators to emit highly energetic, coherent photons. Using high-temperature superconductors (HTS) in the form of coated ReBCO tape superconductors...
To reduce the projected transverse beam emittance, a solenoid is usually used at normal conducting as well as superconducting radio frequency (SRF) photoinjectors. At the ELBE SRF Gun-II, a superconducting solenoid is located inside the gun´s cryomodule about 0.1 m far from the end of the gun cavity. The aberration of the solenoid field, such as the quadrupole component, will influence the...
Laser-plasma acceleration (LPA) promises compact sources of high-brightness electron beams for science and industry. However, transforming LPA into a technology to drive real-world applications remains a challenge. Machine learning techniques could prove decisive in further understanding and improving the performance of these machines. Here, we discuss the application of supervised learning to...
The interaction of overdense and/or near-critical plasmas with ultra-intense laser pulses presents a promising approach to enable the development of very compact sources for high-energetic ions. However, current records for maximum proton energies are still below the required values for many applications, and challenges such as stability and spectral control remain unsolved to this day. In...
Numerical beam dynamics simulations are essential tools
in the study and design of particle accelerators, but they can
be prohibitively slow for online prediction during operation
or for systematic evaluations of new parameter settings. Ma-
chine learning-based surrogate models of the accelerator pro-
vide much faster predictions of the beam properties and can
serve as a virtual...
To understand the underlying complex beam dynamics
in electron storage rings often large numbers of single-shot
measurements must be acquired continuously over a long
period of time with extremely high temporal resolution. Pho-
tonic time-stretch is a measurement method that is able to
overcome speed limitations of conventional digitizers and en-
able continuous ultra-fast single-shot...
The particle physics experiment A4 [1] at the Mainz Microtron (MAMI) produced a stream of valuable data for many years which already released scientific output of high quality and still provides a solid basis for future publications. Here, we report from our approach to make the data hoard of a dismounted project sustainable and publishable according to the FAIR principles which, finally,...
The PUNCH4NFDI Consortium in the German NFDI has as its central deliverable the so-called science data platform SDP, in which complex workflows can be executed on digital research products in a transparent, automatised and FAIR way. The SDP consists of several ingredients that are more or less far advanced in their development and the interplay and interfacing of which is now being...
Long-wavelength neutrons for the investigation of nano-scale materials are an indispensable tool in neutron research. To slow down the free neutrons produced in a large-scale source to energies of a few meV and below, hydrogen-rich materials at cryogenic temperatures are applied.
At the High Brilliance Neutron Source (HBS) project, multiple cold moderators will be positioned inside the same...
Timing is becoming more and more critical for particle physics. The EUDET telescopes only provide minimal timing and require an upgrade to keep up with the demands. Currently, two upgrade projects are pursued at DESY. Firstly the TelePix project to provide an ns timestamp combined with a flexible region of interest trigger as well as an LGAD layer for the ultimate time resolution. Both...
Coherent synchrotron radiation (CSR) is emitted when the emitting structure is equal to or smaller than the observed wavelength. Consequently, these pulses are very short and most detectors respond with their impulse response, regard- less of the pulse length and shape. Here we present single- shot measurements performed at the Karlsruhe Research Accelerator (KARA) using a fast real-time...
Synchrotron light sources operate with bunch repetition rates in the MHz regime. The longitudinal and transverse beam dynamics of these electron bunches can be investigated and characterized by experiments employing linear array detectors. To improve the performance of modern beam diagnostics and overcome the limitations of commercially available detectors, we have developed KALYPSO, a...
Ultra-high-intensity laser pulse interactions with solid density targets are of central importance for modern accelerator physics, Inertial Confinement Fusion(ICF) and astrophysics. In order to meet the requirements of real-world applications, a deeper understanding of the underlying plasma dynamics, including plasma instabilities and acceleration mechanisms, is needed. X-ray radiation plays a...
