ARD-ST3 Annual Workshop

Europe/Berlin
SR3 (DESY, Zeuthen)

SR3

DESY, Zeuthen

Platanenallee 6 15738 Zeuthen Germany
Anke-Susanne Müller, Holger Schlarb, Michael Gensch
Description
Group Photo
Better resolution
The Helmholtz Initiative for Accelerator Research & Development (ARD) was established to strengthen development in accelerator physics and technology and to ensure international competitiveness. In this framework, accelerator scientists push the limits of today’s technology in a research network of six Helmholtz centers (Deutsches Elektronen-Synchrotron (DESY) in Hamburg and Zeuthen, Helmholtz Zentrum Dresden-Rossendorf (HZDR), Forschungszentrum Jülich (FZJ), Helmholtz Zentrum for Heavy Ion Research GSI in Darmstadt, Karlsruhe Insitute for Technology (KIT), and Helmholtz Zentrum Berlin for Materials and Energy (HZB) ), two Helmholtz institutes, eleven universities, two Max-Planck institutes, and the Max-Born institute. The fifth ARD topical workshop on “ps - fs Electron and Photon Beams” will focus on three fundamental areas of current research in the field of short pulse particle accelerators, namely research related to synchronization and seeding, ultra-fast pulse diagnostics, and photon radiation and interaction. The workshop aims to bring to together scientists from universities and Helmholtz centers that are involved in the subtopic 3 (ST3) “ps – fs Electron and Photon Beams” of the ARD program. It shall serve to further strengthen collaborative projects at and between the different accelerator facilities. The workshop shall also serve to educate young researchers and students participating in projects and experiments within ST3.
    • 12:00 PM 1:00 PM
      Arrival, Registration and Welcome of Participants SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 12:00 PM
        Arrival, Registration and Welcome of Participants 1h
    • 1:00 PM 2:10 PM
      Facility Reports SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 1:00 PM
        XFEL 25m
        Speaker: Winfried Decking
        Slides
      • 1:25 PM
        KIT 15m
        Speaker: Marcel Schuh
        Slides
      • 1:40 PM
        HZB 15m
        Speaker: Dr Michael Abo-Bakr
        Slides
      • 1:55 PM
        PITZ 15m
        Speaker: Frank Stephan
        Slides
    • 2:10 PM 3:00 PM
      Coffee Break 50m SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 2:10 PM 3:00 PM
      Two tours of PITZ (each tour limited to 10 persons) SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 2:10 PM
        First Tour of PITZ (limited to 10 persons) 20m PITZ (DESY Hamburg)

        PITZ

        DESY Hamburg

      • 2:30 PM
        Second Tour of PITZ (limited to 10 persons) 20m SR3

        SR3

        DESY, Zeuthen

        Platanenallee 6 15738 Zeuthen Germany
    • 3:00 PM 4:45 PM
      Electron diffraction SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 3:00 PM
        REGAE: Electron Beams for Time Resolved Diffraction Experiments 20m
        Speaker: Klaus Floettmann
        Slides
      • 3:20 PM
        Application of Ultrafast Electron Diffraction: photo-induced phase transitions in organic molecular crystals 20m
        Speaker: Heinrich Schwoerer (MPSD)
        Slides
      • 3:40 PM
        Nonthermal structural dynamics probed by momentum-resolved femtosecond electron diffraction 40m
        Speaker: Ralph Ernstorfer
        Slides
      • 4:20 PM
        Discussion 25m
    • 4:45 PM 5:00 PM
      Coffe Break 15m SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 5:00 PM 6:30 PM
      Tutorial 1 SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 5:00 PM
        Introduction to FEL Physics 1h 30m
        Speaker: Jörg Rossbach (Uni HH)
        Slides
    • 9:00 AM 10:00 AM
      Session 1: Beam Dynamics and Photon Sources SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 9:00 AM
        Machine Learning Applications at a Storage Ring 20m
        Speaker: Tobias Boltz (KIT)
        Slides
      • 9:20 AM
        Punched beams or smoke rings at XFEL 20m
        Speaker: Dr Matthias Scholz
        Slides
      • 9:40 AM
        Resonance islands at storage rings 20m
        Speaker: Paul Goslawski
        Slides
    • 10:00 AM 10:36 AM
      Speed-Posterpresentation: Beam Dynamics and Photon Sources SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 10:00 AM
        SP1: OCELOT as a Framework for Beam Dynamics Simulations of X-Ray Sources 3m
        OCELOT is an open source toolkit for beam dynamics and free electron laser simulations written in Python. Recently the main collective effects (space charge, coherent synchrotron radiation, wakefield) were implemented in OCELOT. In developing of the full-dimensional numerical modeling we pursue two important competitive aspects: the simulation has to be fast and has to include accurate estimations of collective effects. The simulation results for the European XFEL are presented. The results have been benchmarked against other codes and some of such benchmarks are shown.
        Speaker: Dr Sergey Tomin (European XFEL)
        Poster
        Slides
      • 10:03 AM
        SP2: Study of a superconducting superradiant THz undulator at the European XFEL 3m
        A THz radiation for pump-probe experiments etc. is under consideration at the European XFEL using laser-based and / or accelerator-based techniques. Wherein, a superconducting THz undulator as an afterburner would be one option because it has an advantage to produce wide-range radiation thanks to an ultra-short bunch and high repetition rate. A challenge to this approach is the usage of very high electron beam energy up to 17.5 GeV and the requirement of a high magnetic field. In this presentation, we will report the preliminary study of the THz undulator design and the radiation properties at the European XFEL.
        Speaker: Dr Takanori Tanikawa (European XFEL)
        Slides
      • 10:06 AM
        SP3: THz driven electron acceleration and streaking with a multilayer structure 3m
        We present a THz-based electron accelerator and electron streak camera using a novel multilayer waveguide structure to utilize strong-field single-cycle THz pulses. It allows for very efficient electron acceleration and streaking using transversely-coupled short THz-waveguides with dielectric delay sections which realize phase-matching between electrons and a single-cycle THz pulse. Proof-of-concept experiments are described demonstrating 13 keV energy gain and femtosecond time resolution for 57 keV electron bunches from a DC-gun, which is in good agreement with simulation.
        Speaker: Dr Dongfang Zhang (Deutsches Elektronen-Synchrotron)
      • 10:09 AM
        SP4: Simulation of MeV Femtosecond electron diffraction performance based on PITZ beamline 3m
        PITZ is a photoinjector test facility for FLASH and European XFEL, and it has been proposed to be a prototype machine to develop an accelerator based THz source for European XFEL pump-probe experiment. In addition, the machine can also support femtosecond electron diffraction at the same beam repetition rate as European XFEL, which brings XFEL users more flexibility for different experiments. In this poster, a femtosecond electron diffraction scheme based on the PITZ accelerator setup is simulated.
        Speaker: Dr Houjun Qian (DESY-Zeuthen)
        Poster
        Slides
      • 10:12 AM
        SP5: Preliminary On-table and Photoelectron Results from the PITZ Quasi Ellipsoidal Photocathode Laser System 3m
        The optimization of photoinjectors is crucial for the successful operation of linac-based free electron lasers, and beam dynamics simulations have shown that ellipsoidal photocathode laser pulses result in significantly lower electron beam emittance than that of conventional cylindrical pulses. Therefore, in collaboration with the Institute of Applied Physics (Nizhny Novgorod, Russia) and the Joint Institute of Nuclear Research (Dubna, Russia), a laser system capable of generating quasi-ellipsoidal laser pulses has been developed and installed at the Photo Injector Test facility at DESY, Zeuthen site (PITZ). The pulse shaping has been realized using the spatial light modulator technique, characterized by cross-correlation and spectrographic measurements, and is demonstrated with electron beam measurements. In this contribution the overall setup, operating principles, and results of first regular electron beam measurements will be presented together with corresponding beam dynamics simulations. Furthermore the numerous improvements of the simplified re-design currently under construction shall be detailed.
        Speaker: Mr Good James (PITZ, DESY)
        Poster
        Slides
      • 10:15 AM
        SP6: Experimental Optimization and Characterization of Electron Beams for Generating IR/THz SASE FEL Radiation with PITZ 3m
        The Photo Injector Test facility at DESY, Zeuthen site (PITZ), develops high brightness electron sources for modern linac-based Free Electron Lasers (FELs). The PITZ accelerator can also be considered as a suitable machine for the development of an IR/THz source prototype for pump-probe experiments at the European XFEL. One of the interesting options for the IR/THz generation with PITZ is to generate the radiation by means of a SASE FEL using an uncompressed electron beam with bunch length of a few 10 ps and a peak current of ~200 A. In this contribution, results of experimental optimizations and characterizations, including transverse phase space, slice transverse emittance and longitudinal phase space, of electron beams with bunch charges of 4 nC are presented and discussed. The measurements were done with beam momenta of 15 MeV/c and 22 MeV/c. Results of IR/THz SASE FEL calculations by using the GENESIS1.3 code based on the measured beam parameters are also presented and discussed.
        Speaker: Mr Prach Boonpornprasert (DESY, Zeuthen)
        Poster
        Slides
      • 10:18 AM
        SP7: The impact of microbunching on the synchrotron radiation spectrum at bERLinPro 3m
        bERLinPro is a high average current energy recovery LINAC prototype. Although the space charge driven microbunching instability (MBI) is not expected to occur during the nominal operation of bERLinPro, there are possibilities to drive the microbunching. These include the use of a FODO-Lattice in the straight section and/or shortening of the bunch length. Thus, taking advantage of these possibilities bERLinPro enables dedicated investigation on MBI and future MBI-based radiation sources. In this connection the investigation of the impact of microbunching on the spectrum of emitted synchrotron radiation at bERLPro is of great interest. The presented work studies this effect using numerical simulations. ASTRA is used to track bunches through most of the recirculation structure. Thereafter WAVE is used to track the bunches through a dipole field map and calculate the synchrotron radiation spectrum. In addition to the nominal bunch and current lattice of bERLinPro a new lattice including the proposed FODO structure and a shorter bunch are also considered.
        Speaker: Mr Paul Volz (Helmholtz-Zentrum Berlin)
        Poster
        Slides
      • 10:21 AM
        SP8: Photoelectron beam asymmetry studies at PITZ 3m
        The main task of PITZ facility (Photo Injector Test Facility at DESY, Zeuthen site) is developing and testing of photoelectron sources (photoelectron guns) for free-electron lasers like FLASH and European XFEL. The operation of the multiple gun prototypes discovered the presence of photoelectron beam asymmetries in transverse shape and projected emittance between x and y planes. The studies of the source of transverse beam asymmetry and its compensation by a pair of normal and skew quadrupoles are presented in this poster.
        Speaker: Mr Igor Isaev (DESY)
        Poster
        Slides
      • 10:24 AM
        SP9: Status and test-stand of the SRF photoinjector for bERLinPro 3m
        Status and test-stand of the SRF photoinjector for bERLinPro
        Speaker: Georgios Kourkafas (HZB)
        Slides
      • 10:27 AM
        SP10: Seeding at Electron Storage Rings 3m
        Seeding is the interaction of electrons with an external radiation pulse to produce a particular radiation output. This may be the radiation of a free-electron laser (FEL) at a linear accelerator or an ultrashort synchrotron radiation pulse at a storage ring. Aspects of FEL seeding may also be tested at storage rings with high stability of the beam and high repetition rate. Examples of seeding experiments in the context of coherent harmonic generation (CHG) at the synchrotron radiation source DELTA in Dortmund will be given.
        Speaker: Prof. Shaukat Khan (Technische Universitaet Dortmund)
        Poster
        Slides
      • 10:30 AM
        SP11: Operation of FLASH with ultra-short SASE-FEL pulses 3m
        The experience on the generation of very short FEL pulses in the soft x-ray range in the SASE-mode at the high-gain free-electron laser FLASH is presented. The usage of short injector laser pulses and thus short, low charge bunches directly at the photo-cathode eases the required bunch compression factor for short pulses below 10 fs duration. The corresponding beam dynamics of such short bunches is discussed.
        Speaker: Marie Rehders (Hamburg Universy)
      • 10:33 AM
        SP12: Bell’s instability: from astrophysics to laboratory experiment 3m
        The diffusive shock acceleration at the forward shocks of shell-type supernova remnants is considered as a process to generate high energy cosmic ray particles. For efficient acceleration, magnetic field fluctuations stronger than the background interstellar field are indispensable in the upstream region of the shock. Bell’s instability, a cosmic-ray stream driven instability, is proposed as a candidate for providing the required magnetic turbulence. In recent MHD studies and Particle-In-Cell (PIC) simulations show that the magnetic field fluctuations stronger than the background interstellar field is expectable theoretically. In order to examine the saturation level and mechanism of Bell’s instability in the laboratory, we attempt to develop a laboratory experiment by using the plasma cell and electron source of the PITZ group at DESY in Zeuthen. Here, we present the technical design of the experiment and provide information on preparatory computational investigations based on fully kinetic particle-in-cell simulations with OSIRIS.
        Speaker: Dr Chun-Sung Jao (DESY)
        Slides
    • 10:36 AM 10:45 AM
      Coffee Break 9m SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 10:45 AM 12:15 PM
      Speed-Postersession: Beam Dynamics and Photon Sources SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 10:45 AM
        Speed-Postersession: Beam Dynamics and Photon Sources 1h 30m
    • 12:15 PM 12:30 PM
      Workshop photo SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 12:15 PM
        Workshop photo 15m
    • 12:30 PM 1:30 PM
      Lunch 1h SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 12:30 PM 1:30 PM
      Tour of PITZ (limited to 10 persons) SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 12:30 PM
        First Tour of PITZ (limited to 10 persons) 20m
      • 1:10 PM
        Second Tour of PITZ (limited to 10 persons) 20m
    • 1:30 PM 2:00 PM
      Follow up on THz radiation SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 1:30 PM
        Follow up on THz radiation 30m
        Speaker: Michael Gensch
        Slides
    • 2:00 PM 3:00 PM
      Session 2: Beam Diagnostics SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 2:00 PM
        Terahertz Streaking with Split Ring Resonator at FLUTE 20m
        Speaker: Erik Bründermann
        Slides
      • 2:20 PM
        X-band TDS Project at DESY 20m
        Speaker: Barbara Marchetti
        Slides
      • 2:40 PM
        Arrival time and Intensity Binning at high quasi-cw reperates: the big data challenge 20m
        Speaker: Bertram GREEN
        Slides
    • 3:00 PM 3:30 PM
      Speed-Posterpresentation: Beam Diagnostics SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 3:00 PM
        SP1: Update of KALYPSO systems 3m
        KALYPSO is a 1D detector fully coupled with an Electro-Optical beam profile measurement for a sub-ps resolution at ANKA and Eu-XFEL. A recent update of the KALYPSO project will be presented. Several ongoing developments have been started to improve the performance in term of femtosecond time accuracy, noise and higher frame-rate. A custom front-end Application Specific Integrated Circuit (ASIC) has been developed to operate in low-noise condition up to 10 MHz frame-rate. Several new linear array sensitive elements have been designed and submitted for the final production, with a higher number of pixels (512/1024) and smaller pixel pitch. A Low Gain Avalanche Diode (LGAD) sensor is being developed to improve the time resolution. Finally, a DAQ framework transmits data to external GPU-based clusters, where data is processed in real-time at 7 Gbytes/s and latency in the order of few μs.
        Speaker: Dr Michele Caselle (KIT)
        Poster
        Slides
      • 3:03 PM
        SP2: Photodiode Setup for measuring short photon pulses 3m
        Photodiode Setup for measuring short photon pulses
        Speaker: Dr Ji-Gwang Hwang (Helmholtz-Zentrum Berlin)
      • 3:06 PM
        SP3: Time-resolved energy spread studies at the ANKA storage ring 3m
        The usage of a fast-gated intensified camera (FGC) allows to study the horizontal bunch size and thus the energy spread on a single turn base. At the ANKA storage ring such a camera is embedded into a synchronisation scheme for the synchronous detection of the horizontal bunch size, the CSR intensity as well as the longitudinal bunch profile. Here we present the result of these studies with focus on synchronous measurements of the energy spread and the CSR intensity.
        Speaker: Mr Benjamin Kehrer (Karlsruhe Institute of Technology)
        Poster
        Slides
      • 3:09 PM
        SP4: Continuous bunch-by-bunch THz acquisition: 4-channel spectrometer and study of possible multi-bunch effects 3m
        The micro-bunching instability causes the formation of time-varying sub-structures in the longitudinal phase space leading to fluctuations and strong bursts in the observed coherent synchrotron radiation (CSR) in the terahertz (THz) frequency range. These fluctuations can be detected simultaneously for each individual bunch in a multi-bunch environment using fast THz detectors combined with the KAPTURE readout system. This combination allows us to study the possibility of multi-bunch effects on the characteristic bursting behavior of the micro-bunch instability. Additionally the spectral information of the CSR contains valuable information about the bunch length, shape and sub-structures. This can be studied with a spectrometer setup consisting of 4 ultra-fast THz detectors, sensitive in different frequency bands.
        Speaker: Miriam Brosi (KIT)
        Poster
        Slides
      • 3:12 PM
        SP5: Double-Pulse Mode of a Streak Camera for BESSY-VSR 3m
        Optimization of a Streak Camera for Simultaneous Measurements of Short and Long bunches at the BESSY-VSR facility
        Speaker: Prof. Gregor Schiwietz (Helmholtz-Zentrum Berlin (HZB))
      • 3:15 PM
        SP6: Online Longitudinal Bunch Profile and Slice Emittance Diagnostics at the European XFEL 3m
        The longitudinal current profile and slice emittance are important bunch parameters for the operation of an X-ray free-electron laser. At the European XFEL, dedicated diagnostic sections equipped with transverse deflecting RF structures (TDS) have been installed for the control and optimisation of these parameters. Travelling-wave TDS in combination with fast kicker magnets and off-axis screens allow for the study of individual bunches without affecting the other bunches in the super-conducting linear accelerator which can generate bunch trains of up to 2700 bunches at 4.5 MHz within 600 microsecond RF pulses at a repetition rate of 10 Hz. The diagnosed bunch is taken out of the bunch train before the FEL undulators while the remaining bunches continue for the generation of FEL radiation. The measurement of the slice emittance is realised in a static FODO lattice equipped with four individual screen stations. Variations of the longitudinal bunch profile or slice emittance along the bunch train may lead to suppressed FEL performance for parts of the train reducing the effective available number of bunches for FEL operation. By gradually adjusting the timing, individual bunches along the bunch train can be studied in order to optimise the overall beam parameters for all bunches in the train. In this paper, we describe the diagnostic concept and realisation in detail and summarise first performance studies. Results of emittance measurements along the bunch train are presented.
        Speaker: Dr Christopher Gerth (DESY)
        Slides
      • 3:18 PM
        SP7: Measurement of Coherent THz Radiation using On-Chip Spectrometer 3m
        A novel on-chip spectrometer based on arrays of Schottky diodes has been developed. Showing promising results in a first experiment at TELBE (operation at room temperature, excellent signal-to-noise ratio up to MHz repetition rates, sufficient spectral filtering), optimized versions have been developed aiming at better frequency resolution and lower crosstalk between the frequency resolved outputs. All elements exhibit a similar linear behavior which is favorable for an easy evaluation of the spectrally resolved data. Charge-dependent spectra have been recorded. The output of the spectrometer chip follows the general spectral shape measured with traditional time-domain spectroscopy even without proper calibration.
        Speaker: Dr Niels Neumann (TU Dresden, Chair for RF and Photonics Engineering)
        Slides
      • 3:21 PM
        SP8: EOD@XFEL - First results from commissioning 3m
        The setup of the lectro-optical bunch length detection system (EOD) at the first bunch compressor at the E-XFEL are described and the first results from comissioning will be presented.
        Speaker: Dr Bernd Steffen (DESY)
        Slides
      • 3:24 PM
        SP9: Research at the Pico- & Femtosecond Scale at FLUTE 3m
        We report on the current status of the test facility FLUTE and progress towards the first experiment for electron streaking in the femtosecond time range.
        Speaker: Dr Michael Nasse (Karlsruhe Institute of Technology)
        Slides
      • 3:27 PM
        SP10: Investigation of electronic noise of the charge measuring system at PITZ 3m
        The Photo Injector Test facility at DESY, Zeuthen site (PITZ) develops high brightness electron sources for modern linac-based Free Electron Lasers (FELs). A precise measurement of electron beam (e-beam) charge is essential. Several Faraday Cups (FCs) and Integrating Current Transformers (ICTs) are installed along the PITZ beamline to measure the e-beam charge. In order to improve the accuracy of the e-beam charge measurement at PITZ, causes of the measurement error are investigated. It’s found that the measurement error for ICTs is dominated by the electronic noise. An unknown 300 kHz harmonic which makes a significant contribution to the measurement error is observed. The source of the 300 kHz noise is investigated and presented, as well as the solutions.
        Speaker: Mrs xin li (PITZ, DESY)
        Poster
        Slides
    • 3:30 PM 3:45 PM
      Coffee Break 15m SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 3:45 PM 5:00 PM
      Speed-Postersession: Beam Diagnostics SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 3:45 PM
        Speed-Posterpresentation: Beam Diagnostics 1h 15m
    • 5:00 PM 6:30 PM
      Tutorial 2 SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 5:00 PM
        Ambiguities in bunch shape reconstruction from spectroscopic data 1h
        Speaker: Peter Schmüser
        Slides
    • 6:30 PM 10:00 PM
      Workshop Dinner - BBQ 3h 30m DESY Zeuthen

      DESY Zeuthen

    • 9:00 AM 10:00 AM
      Tutorial 3 SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 9:00 AM
        Tutorial on beam dynamics in RF photoinjector 1h
        Speaker: Mikhail KRASILNIKOV
        Slides
    • 10:00 AM 11:00 AM
      Session 3: Control, Synchronisation, Stability SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 10:00 AM
        XUV seeding at sFLASH 20m
        Speaker: Jörn Bödewadt
        Slides
      • 10:20 AM
        Sensiblesteps into the digital age of science 20m
        Speaker: Michael Busmann
        Slides
      • 10:40 AM
        Online processing with GPUs in data acquisition system for improved data quality and control 20m
        Speaker: Andreas Kopmann
        Slides
    • 11:00 AM 11:36 AM
      Speed-Posterpresentation: Controls, Synchronization, Stability SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 11:00 AM
        SP1: Towards femtosecondlevel intrinsic synchronization between accelerators and external laser systems 3m
        Timing jitter between accelerator light sources and external laser systems is one of the crucial parameters which limits temporal resolution and sensitivity of ultrafast time-resolved experiments involving the large-scale facilities. Here, we demonstrate proof of principle realization of a terahertz-based intrinsic synchronization concept that in principle is applicable at any accelerator working with ultra-short electron bunches.
        Speaker: Mr Min Chen (Helmholtz - Zentrum Dresden - Rossendorf)
      • 11:03 AM
        SP2: Overview on Timing and Sychronization systems for bERLinPro 3m
        Timing and synchronization systems are crucial components for the successful operation of the Energy Recovery Linac (ERL) at HZB known as bERLinPro and foreseen to start its commissioning phase in autumn 2018. The systems are used not only to synchronize different processes but also to time-stamp, to distribute reference frequencies and triggers to sub-components, and to ensure overall coherence of the ERL. The proposed poster describes fundamentals and basics of the systems, the ERL requirements, and the adopter strategy and technology.
        Speakers: Dr Erdem Motuk (Helmholtz Zentrum Berlin (HZB)), Dr Karim Laihem (Helmholtz Zentrum Berlin (HZB))
        Slides
      • 11:06 AM
        SP3: Precise Optical Synchronization for FELs, Electron Diffraction, and LWA/LPA Facilities at DESY 3m
        This Poster gives an overview on the laser-based synchronization and pulsed optical reference distribution activities at DESY, covering large-scale systems like the one for the European XFEL with more than 30 actively stabilized fiber links with up to 3.4 km length, as well as the many other setups for different machines like REGAE, SINBAD, and FLASH including the plasma experiments within the LAOLA collaboration.
        Speaker: Mr Matthias Felber (DESY)
        Slides
      • 11:09 AM
        SP4: Longitudinal Diagnostics for Beam-based Feedback Systems at the European XFEL 3m
        At modern Free Electron Lasers, the key for time resolved experiments is a high precision regulation of bunch parameters such as arrival time and compression. In order to achieve these requirements on the beam properties, both for single bunches and within a bunch train, it is necessary to combine RF field and beam based feedback loops, optimised for different frequency domains. To correct for slow temporal drifts in the few Hz region a feedback system is implemented based on an inverted multi-dimensional matrix which contains the responses of the bunch properties charge, arrival time, compression and energy with respect to variations of various machine parameters. Here, we present the experimental setup of the Bunch Arrival-time and Bunch Compression Monitors and first results from longitudinal beam response measurements and feedback operation at the European XFEL.
        Speaker: Dr Marie Kristin Czwalinna (DESY)
        Poster
        Slides
      • 11:12 AM
        SP5: FPGA and Piezo controllers development for CW operation of SRF Cavities 3m
        The level radio frequency (LLRF) control systems stabilize the accelerating field inside accelerating modules, and control the resonance frequency of the individual cavities. Modern LLRF control systems are designed as digital processing systems, and are based on the field programmable gate array (FPGA) technology. In the continuous wave (CW) operation, a special high power RF amplifier is required, different than the pulsed klystron, such as currently used inductive output tube (IOT). This has a major impact on the RF controller development. High loaded Q of cavities operating in the continuous wave (CW) mode, requires more accurate resonance control methods. However, mechanical characteristics of the cavities affects the controller design in such a way that the classical proportional-integral scheme is insufficient. In addition, learning feed forward methods, successfully applied in the pulsed accelerators are not suitable for the CW. To overcome those limitations, a novel real-time algorithm is implemented in the FPGA. In this contribution, we report on recent development activities at DESY towards ultrahigh precision multi-cavity vector sum stabilization. Performance measurements of the proposed solution were conducted at the cryomodule test bench facility. Obtained results meet the stability requirements for the E-XFEL.
        Speaker: Dr Radoslaw Rybaniec (DESY)
      • 11:15 AM
        SP6: Femtosecond Level Laser-to-RF Synchronization Developments at REGAE 3m
        Mach-Zehnder Modulator based Laser-to-RF synchronization setup working at 800 nm wavelength has already shown excellent femtosecond level timing jitter and drift performance. Recently we evaluated the critical parts of the setup to further improve the timing jitter performance. This can be achieved by reducing the noise floor of the readout electronics and installing the well engineered 800 nm integrated MZMs. In this contribution we present the experimental results of these developments.
        Speaker: Mr Mikheil Titberidze (DESY)
        Slides
      • 11:18 AM
        SP7: ROOT based tools for DAQ data analysis of the PITZ gun operation 3m
        Conditioning of an L-band RF gun is a lengthy process (typically about 3 months). The evaluation of the conditioning progress and of the reliability of the operation involves tens of sensors (RF measurements, photomultiplier signals, interlocks, pressure gauges, etc.) which are acquired at 10 Hz repetition rate. In order to simplify the gathering of this large volume of data from the data acquisition system (DAQ) and its analysis, a ROOT based library of tools has been developed. That library can take into account that measured physical properties can have complex history: the name of the variable within the control system, the scale or the offset can change over the period of interest. Simple functions allows to retrieve the data from the DAQ, analyze and plot the results. Tools from the library is routinely used for different purposes such as to generate automatic shift summaries or to create operation overview for the run coordination meetings at PITZ.
        Speaker: Yves Renier (DESY)
        Poster
        Slides
      • 11:21 AM
        SP8: Design and status of a MicroTCA.4 based LLRF system for TARLA 3m
        The Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) are constructing a 40 MeV Free Electron Laser in continuous wave RF operation. In order to control and monitor the four superconducting (SC) TESLA type cavities as well as the two normal conducting buncher cavities a MicroTCA.4 based LLRF system is foreseen. This highly modular system is further used to control the mechanical tune of the SC cavities by control of piezo actuators and mechanical motor tuners. We are going to describe the system setup and integration in the existing accelerator environment, hardware and software wise.
        Speaker: Mr Christian Schmidt (DESY)
        Poster
        Slides
      • 11:24 AM
        SP9: Next Generation Field Detectors 3m
        For a reliable and robust operation of free-electron lasers with bunch-arrival time variations on the sub 10fs scale, the short-term and long-term stability of the cavity field is an important factor. Modern field-detectors using the non-IQ sampling scheme achieve at 1.3GHz operating frequency 0.01% amplitude, respectively 0.0035deg phase or 4fs stability within a measuring bandwidth of 1MHz. Front-end mixer, LO-geenration and todays available sampling ADCs are the main limitations. To overcome their 1/f-noise, we investigate interferometer based amplitude and phase detectors. In detail we compare conventional phase noise measurements using saturated mixers and interferometric techniques.
        Speaker: Ms Louise Springer (DESY)
        Poster
        Slides
      • 11:27 AM
        SP10: Optical Synchronization Controls Software 3m
        Precise femtoseconds synchronization is required for many advanced applications and experiments conducted with laser light generated by X-ray free-electron lasers facilities like FLASH or E-XFEL. In order to obtain this goal dedicated laser based synchronization system has been developed to simultaneously lock all independent components, including accelerator modules and all external optical lasers. The system, except mechanic and optical part, includes advanced control electronics, firmware and high level software. This paper presents architecture and features of control software designed to achieve high performance, flexibility, scalability, maintainability of laser optical synchronization system based on MTCA.4 architecture which is currently being deployed at E-XFEL and is planned to be applied at FLASH accelerator.
        Speaker: Mr Tomasz Kozak (DESY)
        Slides
      • 11:30 AM
        SP11: Progress on on-line FEL optimization software 3m
        We present recent developments of the empirical FEL tuning software tools within the OCELOT suite, including the experience from the European XFEL commissioning with using various photon and electron beam parameter objectives. New development directions related to data analytics and accelerator physics model validation will be briefly discussed.
        Speaker: Dr Sergey Tomin (European XFEL)
        Poster
        Slides
      • 11:33 AM
        SP12: Fault Diagnosis for the XFEL: Possibilities and Challenges 3m
        Fault Diagnosis plays a large role for automating systems and making their operation safer and more reliable. From airplanes to cars to big industrial plants, fault diagnosis methods are applied to lessen downtime and predict maintenance as well as to avoid unnecessary failures. This poster discusses the challenges and possibilities to make use of an automatic fault diagnosis system for the XFEL.
        Speaker: Ms Ayla Nawaz (DESY)
        Poster
        Slides
    • 11:36 AM 11:45 AM
      Coffee Break 9m SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 11:45 AM 12:45 PM
      Speed-Postersession: Controls, Synchronization, Stability SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 11:45 AM
        Speed-Postersession: Controls, Synchronization, Stability 1h
    • 12:45 PM 1:00 PM
      Closing Session SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 12:45 PM
        Closing Session 15m
    • 1:00 PM 2:00 PM
      End SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 1:00 PM
        End 1h
    • 1:00 PM 2:00 PM
      Optional: Lunch at Zeuthen Canteen 1h SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
    • 2:00 PM 2:20 PM
      Tour of PITZ (limited to 10 persons) SR3

      SR3

      DESY, Zeuthen

      Platanenallee 6 15738 Zeuthen Germany
      • 2:00 PM
        Tour of PITZ (limited to 10 persons) 20m