4th ARD ST3 Workshop - Matter and Technology
→
Europe/Berlin
WCRC Hörsaal (14.51-3147) (HZB Berlin)
WCRC Hörsaal (14.51-3147)
HZB Berlin
Albert-Einstein-Str. 15
Anke-Susanne Mueller
(KIT),
Holger Schlarb
(DESY),
Michael Gensch
(DESY)
Description
Link to the workshop photo: https://indico.desy.de/conferenceDisplay.py/getPic?picId=0&confId=14765
This is the 4th workshop of a series of workshops within the Accelerator and Research Developement (ARD) topic in the Matter and Technolgy (MT) programme on ps and fs electron and photon beams. Please visit the HZB WEB page of the workshop for registration under
http://www.helmholtz-berlin.de/events/ard-st3/index_de.html
There will be a satelite session "Control System in MT" on Wednesday 13 July 2016 from 12:00 to 15:00. More informations: https://indico.desy.de/conferenceDisplay.py?confId=15096
This is the 4th workshop of a series of workshops within the Accelerator and Research Developement (ARD) topic in the Matter and Technolgy (MT) programme on ps and fs electron and photon beams. Please visit the HZB WEB page of the workshop for registration under
http://www.helmholtz-berlin.de/events/ard-st3/index_de.html
There will be a satelite session "Control System in MT" on Wednesday 13 July 2016 from 12:00 to 15:00. More informations: https://indico.desy.de/conferenceDisplay.py?confId=15096
Participants
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Arrival, Registration and Welcome of Participants
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Arrival, Registration and Welcome of Participants
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Overview Talk: Necessity of Short Pulses - Science PerspectivesSpeaker: Alexander Föhlisch
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HZB Tour
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HZB Tour
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4
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17:00
Coffee
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Facility Reports
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10:15
Coffee
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Session 1: Beam Diagnostics
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SP1: Performing ultra-fast experiments with high dynamic range by high rep-rate pulse-to-pulse detection: Towards 10 fs time resolution at TELBESub cycle dynamics on THz driven Phenomena are an emerging class of experiments in ultra-fast science. Hence THz pump laser probe experiments are an essential class of experiments at the new TELBE THz facility. Even the most modern accelerators can be synchonised only down to 80 fs (peak to peak) by active feedbacks. For that reason a unique high-rep-rate arrivaltime monitoring has been developed at TELBE that provides timing down to (in theory) 12 fs by post-mortem arrivaltime-jitter correctionSpeaker: Mr Bertram Green (HZDR)
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SP2: First measurements for integrated spectrometer with multiple spectral points at TELBESemiconductor based detectors can be used at room temperature and provide bandwidths that are high enough for phase-sensitive detection at the repetition rate of the accelerator. Such an integrated spectrometer may replace the classical single element semiconductor detectors. A demonstrator with multiple spectral points produced in the BMBF funded project "InSEl" has been successfully tested at TELBE. First measurement results are presented and an outlook to the follow-up project "SAMoS" is given.Speaker: Dr Niels Neumann (TU Dresden, Chair for RF and Photonics Engineering)
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SP3: LUX Electron Beam DiagnosticsThe first phase of the LUX experiment is set up and achieved its next mile stone: Plasma accelerated electrons. We present an overview of electron beam diagnostics currently installed at LUX, including the electron spectrometer and a thin LYSO scintillator screen for transverse beam profile imaging.Speaker: Mr Paul Winkler (Center for Free Electron Laser Science & Department of Physics, Hamburg University, Hamburg)
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SP4: ELECTRON BEAM DIAGNOSTICS OF TARLA FACILITYThe Turkish Accelerator and Radiation Laboratory at Ankara (TARLA) is an Infrared Free Electron Laser (IR-FEL) and Bremsstrahlung facility. The TARLA facility is expected to provide 1-10 ps duration pulses with center wavelengths from 2.5-250 µm at a repetition rate of 13 MHz. The current plans and the completed diagnostic for TARLA facility are presented. TARLA injector line diagnostics instrumentation includes: Button beam position monitoring, transverse profile and temporal beam structure monitoring (optical transition radiation beam viewers), beam charge measurements (Faraday cups, Integrated Current Transformers), pepper-pot beam emittance measuring devices and electron beam loss monitoring. The diagnostics provided straight controlling of electron beam behavior and to adjust requested beam parameters within the design specifications. Investigation of the diagnostic instrumentation of the TARLA is given along with measurement examples and discussion of theoretical calculations.Speaker: Mr Caglar Kaya (Ankara University Institute of Accelerator Technologies)
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SP5: KALYPSO - a Mfps linear array detector for visible to NIR radiationThe acquisition rate of commercially available line array detectors is a bottleneck for beam diagnostics at high-repetition rate machines like synchrotron lightsources or FELs with a quasi-continuous or macro-pulse operation. In order to remove this bottleneck we have developed KALYPSO, an ultra-fast linear array detector operating at a frame-rate of up to 2.7 Mfps. The detector mounts InGaAs or Si linear array sensors to measure radiation in the near-infrared or visible spectrum. The FPGA-based read-out card is connected to the external data acquisition system through a high-performance PCI-Express 3.0 data-link, allowing continuous data taking and real-time data analysis. The detector is fully synchronized with the timing system of the accelerator and other diagnostic instruments. The detector is currently installed at several accelerators: ANKA, the European XFEL and TELBE. We present the detector and the results obtained with Electro-Optical Spectral Decoding (EOSD) setups.Speaker: Mr Lorenzo Rota (KIT-IPE)
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SP6: Integrated YBCO detector arrays for single-shot THz spectroscopyThe analysis of variations in the temporal and spectral shape of pulsed radiation emitted by accelerator-based sources in the THz range places high demands on the detection system due to the ultra-short pulse lengths and high repetition frequencies. Detectors based on the high-temperature superconductor YBa2Cu3O7-x (YBCO) offer both a high sensitivity and a fast response time. For direct THz detection response times of 16 ps (FWHM) have been demonstrated [1]. We present a novel detection system aimed at bunch-by-bunch monitoring of the spectrum of single THz pulses. The system consists of an integrated array of YBCO detectors combined with broadband readout in a liquid nitrogen cryogenic system. In the array, the superconducting detectors are coupled to narrowband double-slot antennas [2] for the frequencies 0.14, 0.35, 0.65 and 1 THz, thus enabling a sampling of the pulsed signal at four discrete frequency points with a picosecond time resolution. First tests of a two-channel and a four-channel detector system have recently been successfully conducted at ANKA and at the DIAMOND Light Source. References [1] P. Thoma, et al., Appl. Phys. Lett. 101, 142601, 2012. [2] A. Schmid, et al., IEEE Trans. Appl. Supercond. 26, 3, 2016.Speakers: Mr Alexander Schmid (Karlsruher Institut für Technologie - Institut für Mikro- und Nanoelektronische Systeme), Dr Artem Kuzmin (Karlsruher Institut für Technologie - Institut für Mikro- und Nanoelektronische Systeme)
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SP7: Results of heterodyne mixing of the emitted electric field of synchrotron radiation in the THz-regimeUsing heterodyne spectroscopy we observe the electric field of synchrotron radiation in the THz-Regime. Our measurements of the emitted coherent synchrotron radiation at 270 GHz reveal the discrete frequency harmonics around the 100’000 revolution harmonic of ANKA. We present the effects of the filling pattern structure in multi-bunch mode on the beam spectrum as well as measurements of the synchrotron frequency.Speaker: Johannes Steinmann (Karlsruhe Institute of Technology (KIT))
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SP8: Longitudinal Diagnostics for Beam-Based Intra Bunch-Train FeedbackAt today's free-electron lasers, the high-precision bunch-to-bunch regulation of longitudinal electron beam parameters, such as bunch arrival time and bunch compression, has become an increasingly more important factor for providing a stable and high quality photon beam to the users. At FLASH and the European XFEL a reliable and precise arrival time detection down to the femtosecond level has to cover a broad range of bunch charges, even within a bunch train. At both facilities, the new bunch arrival time monitors have to cope with the special operation mode where the MHz repetition rate bunch train is separated into several segments for different SASE beam lines, each with individual timing jitter characteristics. In this speed poster, we describe the recent developments for the improved bunch arrival time monitor systems currently being installed at both facilities. In parallel to the detector developments, computer simulations are needed for analysing and optimising the feedback regulation scheme.Speaker: Hannes Dinter (DESY)
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SP9: Seeded FLASH pulse metrologyTo characterize ultra-short pulses in the XUV regime, one can use light-field assisted THz streaking. In order to measure the pulse duration as well as the temporal contrast ratio and the degree of temporal coherence of the seeded free electron laser pulse at the sFLASH experiment at DESY, we have installed a THz streaking diagnostic setup at the end of its beam line. A streaked XUV signal has been established and first results will be presented.Speaker: Dr Armin Azima (University of Hamburg)
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Poster Session: Beam Diagnostics
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13:00
Lunch
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WORKSHOP FOTO
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Session 2: Stability, Control and Synchronisation
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SP1: SRF single cavity controlsWe want to summarize the SRF single cavity controls with MTCA.4 electronics. Presented solution is based on the one MTCA.4 crate integrating both RF field control and piezo tuner control systems. The RF controls consist of Rear Transtion Moduel (RTM) for cavity probes sensing and high voltage power source driving, Advanced Mezzanine Card (AMC) for fast data processing and digital feedback operation. The piezo controls have been equipped with high voltage RTM piezo driver and low cost AMC based FMC carrier. The first results from CW operation of the RF and piezo controls are demonstrated and briefly discussed.Speaker: Dr Konrad Przygoda (DESY)
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SP3: CONTROL AND NETWORK SYSTEMS OF TARLA FACILITYThe control system is a central part of accelerator facilities which provides the connection between hardware and the operators. TARLA (Turkish Accelerator and Radiation Laboratory in Ankara, http://tarla.org.tr ) control system which is being developed in EPICS (Experimental Physics and Industrial Control System) framework is designed to run accelerator and supervise auxiliary systems. It covers all aspects of an accelerator system such as high voltage control, beam diagnostic, vacuum, data acquisition and analysis, graphical interfaces etc. The aim is to create fast and reliable control system. Installation and commissioning keep going step by step and once the first beam produced, upgrade and bug fixing studies will continue on control system.Speaker: Mr Ayhan AYDIN (Ankara University)
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SP4: Bunch arrival-time monitoring for laser particle accelerators and Thomson scattering x-ray sourcesThe ELBE center of high power radiation sources at Helmholtz-Zentrum Dresden-Rossendorf combines a superconducting CW linear accelerator with Terawatt- and Petawatt- level laser sources. Key experiments rely on precise timing and synchronization between the different radiation pulses. An online single shot monitoring system has been set up in order to measure the timing between the high-power Ti:Sa laser DRACO and electron bunches generated by the conventional SRF accelerator. This turnkey timing system is suitable for timing control of Thomson scattering x-ray sources and external injection of electron bunches into a laser wakefield accelerator. It uses a broadband RF pickup to acquire a probe of the particle bunch’s electric field and modulates a fraction of the high power laser pulse in a fast electro-optical modulator. The amplitude modulation gives a direct measure for the timing between both beams. Using this setup a resolution of <200 fs RMS has been demonstrated. The contribution will show the prototype, first measurement results and will discuss future modification in order to improve the resolution of the system.Speaker: Dr Michael Kuntzsch (HZDR)
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SP5: Feedback Control for Optical SynchronizationThe European X-ray Free Electron Laser will allow scientists to perform experiments with an atomic scale resolution. To make this experiments possible, a laser-based synchronization system is used to synchronize all subsystems of the facility with a femto-second precision. In this system a Master Laser Oscillator generates a pulse train which is distributed via a length stabilized optical fiber to the different subsystems. At those, the pulse train is e.g. used to synchronize a locally used laser oscillator. This contribution will show the laser synchronization scheme and the universal laser locking firmware from a control theory point of view. This scheme is used for the Master Laser Oscillator and will be used for Laser to Laser synchronization at different subsystems.Speaker: Mr Michael Heuer (Desy)
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SP6: Advanced laser synchronization at REGAEMach-Zehnder Modulator (MZM) based laser-to-RF synchronization setup has been built and commissioned at REGAE. Titanium sapphire laser oscillator has been locked to the 3 GHz RF reference. Long term timing drift performance of the laser synchronization has been measured. Results show outstanding locking performance of 31 fs peak-to-peak over 40 hours of measurement time.Speaker: Mr Mikheil Titberidze (DESY)
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SP8: Fast interlock procedures for NRF cavitiesNormal coducting cavities in particular standing wave structures like a RF gun are sensitive at cross-sections like an RF window. Failure events like a field breakdown can cause severe damage of those devices. A mechanism which allows to stop the RF source as fast as possible is capable to significatly reduce the possibility of broken devices. By monitoring and fast processing on RF based measurements in FPGAs, the reaction time can be reduced to a few microseconds.First experiences of this fast iterlock mechanism at FLASH and the XFEL injector are presented.Speaker: Christian Schmidt (DESY)
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SP9: Model Based Fault Diagnosis for QuenchesUsing a model based approach to determine irregularities and faults in the LLRF signals can lead to a better understanding of the operational limits. A model based method to detect quenches is presented as well as the advanteges and disadvanteges concerning the method.Speaker: Ayla Nawaz (DESY)
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SP10: Temporal characterization of a UV seeded HGHG FEL at FLASHThe free-electron laser facility FLASH at DESY operates since several years in SASE mode, delivering high-intensity FEL pulses in the extreme ultra violet and soft x-ray wavelength range for users. External FEL seeding has proven to be a reliable method to get more control of the characteristics of the FEL pulses. At FLASH, an experimental setup to test different external FEL seeding methods has been operated since 2010. Recently, operation at the 7th harmonic of a 266-nm seed laser using high-gain harmonic generation (HGHG) has been demonstrated. Bunching up to the 11th harmonic was observed for high peak current electron beams. The temporal characterization of the seeded electron bunches using a transverse deflecting structure reveals the properties of the generated FEL radiation pulses. In this contribution, we give an overview of recent experimental results on the seeding activities at FLASH.Speakers: Dr Armin Azima (Universität Hamburg), Dr Jörn Bödewadt (DESY)
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Posters Session: Stability, Control and Synchronisation
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19:00
Workshop Dinner
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Session 3: Beam Dynamics and Photon Sources
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SP1: Considerations for Low-alpha operation in the BESSY II BoosterIt is becoming increasingly apparent that the existing injector systems at BESSY II require an upgrade to meet the high demands of BESSY VSR. A high gradient voltage beat is intended to create the complex longitudinal phase space for the storage of both long and short pulses. High injection rates into this scheme will only be possible using shorter bunches from the Booster. This contribution highlights the benefits of low-alpha operation in the Booster in order to create shorter bunch lengths.Speaker: Dr Terry Atkinson (HZB)
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SP2: European XFEL Injector CommissioningIn the first commissioning phase of the European XFEL SASE FEL driver linac we demonstrated the design goals for the injector section. These goals include reliable operation of sub-systems and feasible beam parameters like emittance and bunch length of the beam produced at the RF gun. Of particular interest is the operation of long bunch trains with up to 2700 bunches with a 4.5 MHz repetition rate. In this poster we will present an overview of our experiences from the injector commissioning run including beam dynamics studies, diagnostics, and system performance.Speaker: Dr Bolko Beutner (DESY)
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SP3: The Ellipsoidal Photocathode Laser System at the Photo Injector Test facility DESY, Zeuthen (PITZ)Optimized photoinjectors are crucial for successful linac-based, free electron laser operation. Beam dynamics simulations have shown that ellipsoidal photocathode laser pulses result in the lowest electron beam emittance. Therefore, in collaboration with the Institute of Applied Physics (Nizhny Novgorod, Russia) and the Joint Institute of Nuclear Research (Dubna, Russia), a prototype laser system capable of generating quasi-ellipsoidal laser pulses was developed and installed at the Photo Injector Test facility at DESY, Zeuthen (PITZ). The pulse shaping was realized through chirped pulse frequency modulation in the Fourier plane with spatial light modulators, and is characterized by both auto- and cross-correlation measurements in the infrared and ultraviolet. In this contribution an overview, preliminary results, and revisions of the prototype quasi-ellipoidal laser, and the subsequent re-design, are presented.Speaker: Dr Tino Rublack (PITZ, DESY)
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SP4: Progress on the AXSIS Attosecond X-Ray FacilityWe present an overview of progress towards the development of the Frontiers in Attosecond Xray Science: Imaging and Spectroscopy (AXSIS) facility, including layouts of the facility, construction updates and progress in the machine design.Speaker: Dr Nicholas Matlis (DESY)
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SP5: Comparison of experimental and theoretical CSR-driven instability thresholds at ANKAThanks to the improved observation techniques, a large amount of experimental results became available recently for the CSR-driven longitudinal single bunch instability thresholds at ANKA. Especially the half island of stability which exists for shorter bunches was investigated in detail. In this regime an unstable bunch will become stable again at certain higher bunch currents. For theoretical predictions the Vlasov-Fokker-Planck solver developed at the HZB was used. With the simple shielded CSR-model the agreement between theoretical and experimental results is surprisingly good in this exotic regime of parameters.Speaker: Dr Peter Kuske (HZB)
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SP6: Studies on beam dynamics of a superconducting damping wiggler in the ANKA storage ring in low-alpha modeIn a collaboration between CERN and KIT a prototype of a superconducting damping wiggler for the CLIC damping rings has been installed at the ANKA synchrotron light source. The wiggler was designed and manufactured by the Budker Institute of Nuclear Physics, Novosibirsk, Russia. To investigate the wiggler’s influence on the beam dynamics in the presence of collective effects ANKA’s low-alpha short bunch operation mode will serve as a model system. Hence we need a model of the ring in low-alpha mode as well as good simulations of the wiggler in the ring. This poster has a focus on mainly two objectives. The first one is the current state of the low-alpha optics simulations of ANKA in a wiggler supporting model. The second one is the simulation of the 3 T damping wiggler in comparison to first measurement results for the normal operation mode with longer bunches and higher energies.Speaker: Gethmann Julian (KIT)
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SP7: Laser Driven High Field Terahertz Sources for Compact Electron AccelerationA family of terahertz generation methods, unified by the common theme of enabling repeated (or cascaded) energy down-conversions of an infrared laser photon by nonlinear optical processes is introduced. The methods can enable laser-to-terahertz energy conversion efficiencies in the 10 % regime, which are two orders of magnitude larger than the current state of the art. Theoretical and record experimental results are highlighted. Such a class of terahertz sources holds promise to transform compact electron accelerator technology with broad implications ranging from electron diffraction to X-ray generation.Speaker: Mr Koustuban Ravi (Center for free electron laser science)
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SP8: First Experimental Characterizations of Electron Beams for THz Options at PITZThe 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 the ideal machine for the development of a tunable IR/THz source prototype for pump and probe experiments at the European XFEL. The IR/THz radiation generated by means of a SASE FEL and Coherent Transition Radiation (CTR) has been considered and studied. A long-bunch electron beam with 4 nC bunch charge and a short-bunch electron beam (compressed by velocity bunching) are used for the studies of the SASE FEL and CTR, respectively. In this contribution, generation and characterization of both types of electron beams from the PITZ accelerator are demonstrated. The corresponding FEL and CTR calculations based on the measured beam parameters are also presented.Speaker: Mr Prach Boonpornprasert (DESY, Zeuthen)
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SP9: Inovesa: A Parallelized Vlasov-Fokker-Planck-Solver for Desktop PCsIn order to simulate the dynamics of an electron bunch in a storage-ring due to the self-interaction with its own coherent synchrotron radiation it is a well established method to numerically solve the Vlasov-Fokker-Planck equation. We present Inovesa, a modularly extensible program that uses OpenCL to massively parallelize the computation, allowing a standard desktop PC to work with appropriate accuracy and yield reliable results within minutes. We provide numerical stability-studies over a wide parameter range, compare our numerical findings to known results. We will show that for ANKA there is a good agreement between measurements and simulation results assuming an impedance due to coherent synchrotron radiation shielded by parallel plates.Speaker: Jonannes Steinmann (KIT)
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SP10: Systematic Studies of Short Bunch-length Bursting at ANKAThe so called low-alpha operation mode allows the reduction of the bunch length in a storage ring down to a few picoseconds. The micro bunching instabilities resulting from the high degree of longitudinal compression lead to fluctuations in the emitted intensity in the THz regime, referred to as bursting. For extreme compressed bunches (small shielding factor) bursting also occurs below the standard bursting threshold. This contribution shows measurements in comparison with simulations of this short bunch-length bursting.Speaker: Johannes Steinmann (KIT)
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Poster Session: Beam Dynamics & Photon Sources
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Closing Session
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Closing report Session 1 - Beam Diagnostics
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Closing report Session 2 - Stability, Control and Synchronisation
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Closing report Session 3 - Beam Dynamics & Photon Sources
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End
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Optional: Lunch at Campus Adlershof
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