Dr Guan Shu (DESY)
High brightness high-repetition rate (MHz-class) electron source for European free-electron lasers (FELs) upgrade program is under design at the Photo Injector Test facility at DESY, Zeuthen site (PITZ). A normal-conducting (NC) cavity resonating in the VHF band at 216.7 MHz operating in continuous wave (cw) mode is chosen as the backup candidate. The preliminary design studies of the NC cw RF...
Dr Sergey Tomin (European XFEL)
As is well known, coherent emission of radiation from ultrarelativistic electron bunches takes place when the duration of the bunches is shorter than the radiation wavelength. In this case, the contributions to the field from all electrons sum up in phase, and the output intensity scales as the square number of electrons in the bunch. In this work, we consider the particular case of coherent...
Mr Patrick Schreiber (KIT)
The beam dynamics in a particle accelerator are influenced by its impedances. In particular at high charge densities, the production of coherent synchrotron radiation is governed by the longitudinal impedance. With Inovesa, an in-house developed simulation tool, it is possible to simulate the dynamics of the longitudinal phase space density inside a storage ring by solving the...
Mr Tobias Boltz (KIT)
The operation of synchrotron light sources with short electron bunches increases the emitted coherent synchrotron radiation (CSR) power in the THz frequency range. However, the spatial compression leads to complex longitudinal dynamics, causing the formation of micro-structures in the longitudinal bunch profiles. The fast temporal variation and small scale of these micro-structures put...
Miriam Brosi (KIT)
At the KIT storage ring KARA (KArlsruhe Research Accelerator), the momentum compaction factor can be reduced leading to natural bunch lengths in the ps range. Due to the high degree of longitudinal compression, the micro-bunching instability arises. During this longitudinal instability, the bunches emit bursts of intense coherent synchrotron radiation in the THz frequency range caused by...
31. Study of a Superconducting Transverse Gradient Undulator for a Laser Plasma Accelerator-Driven FEL
Mr Kantaphon Damminsek (Karlsruhe Institue of Technology)
The application of Laser Wakefield Accelerators (LWFA) is a potential key for realizing extremely compact Free Electron Lasers (FEL) due to an unprecedented high longitudinal electric field inside the laser-driven plasma wave. LWFA-based electron beams exhibit challenging initial conditions in terms of beam divergence and large energy spread. The superconducting transverse gradient undulator...
Mr Takanori Tanikawa (European XFEL)
Different options for proving intense THz filed for THz pump - X-ray probe experiments at the European XFEL using laser-based and/or accelerator-based techniques are currently discussed. Here we present a concept which is based on a superconducting THz undulator utilizing the spent electron beam of the eV scale linac as an afterburner to produce narrowband, tunable, few-cycle THz pulses with...
Mr Takanori Tanikawa (European XFEL)
The photon flux of superradiant THz undulator emission is calculated from the square modulus of electron-bunch form factors and single-particle spectra with a start-to-end simulation. In this presentation, we will report some preliminary results for boosting THz pulse energies assuming specific ideal model bunch forms for the case of the TELBE facility and an envisioned future THz afterburner...
Dr Bertram Green (HZDR) , Mr Tester1 Tester1 (Tester)
Mr Artem Novokshonov (DESY)
Dr Marie Kristin Czwalinna (DESY)
The accelerators of FLASH and of the European XFEL deliver electron bunches in bursts of several hundred pulses with MHz repetition rates every 100ms. These bunches are distributed between different undulator beamlines to generate FEL pulses with few to hundred femtoseconds temporal width in the soft to hard x-ray regime. To run these high repetition rate FELs a large number of different fast...
Carsten Mai (DELTA - TU Dortmund)
Sonja Jaster-Merz (DESY)
In collaboration between DESY MPY-1 and DESY FH ATLAS a silicon strip detector for the ARES spectrometer is being developed. This detector will be used for low (sub-pC) charged beams where a good spatial resolution is needed. It will be placed after the spectrometer dipole. The detector consists of two 1cm x 1cm silicon strip sensors. The readout is done by 4 charge-to-digital converters...
Mr Thiemo Schmelzer (Karlsruhe Intitute of Technology (KIT))
FLUTE (Ferninfrarot Linac- Und Test-Experiment) will be a new compact versatile linear accelerator at KIT. Its primary goal is to serve as a platform for a variety of accelerator studies as well as to generate strong ultra-short THz pulses for photon science. The machine consists of an RF gun, a travelling wave linac and a D-shaped bunch compressor chicane with corresponding diagnostic...
34. Longitudinal electron bunch diagnostics for LWFA based on broadband, spectral CTR measurements at single-shot
Dr Alexander Debus (HZDR) , Mr Omid Zarini (Helmholtz-Zentrum Dresden-Rossendorf)
Laser-wakefield accelerators (LWFA) feature electron bunch durations on a scale of a few fs. Precise knowledge of the longitudinal profile of such ultra-short electron bunches is essential for the design of future table-top X-ray light sources. The resolution limit, as well as the limited reproducibility of electron bunches, pose big challenges for LWFA beam diagnostics. Spectral...
Ms Meghana Mahaveer Patil (KIT)
Linear array detectors with high spatial resolution and MHz frame-rates are essential for high-rate experiments at accelerator facilities. We have developed KALYPSO, a line array detector with 1024 pixels operating at 10 Mfps. To improve the spatial resolution and sensitivity at different wavelengths, novel Si microstrip sensors have been developed with a pitch of 25 μm. Furthermore, to enable...
Dr Niels Neumann (TU Dresden, Chair for RF and Photonics Engineering)
We will introduce the current as well as planned on-chip devices manufactured in standard industrial processes for THz based diagnosis. This includes on-chip spectrometers, multi-element detectors providing spatial information as well as polarization sensitive approaches.
Dr Erik Bruendermann (KIT)
The poster discusses the technologies currently investigated at KIT as potential diagnostic techniques to explore plasma properties of plasma accelerators. The work is supported by the Helmholtz President’s strategic fund IVF "Plasma accelerators".
Dr Sergey Kovalev (Helmholtz Zentrum Dresden Rossendorf)
In this contribution we show how the THz photondiagnostic efforts within ARD-ST3 have enabled several scientific breakthrough experiments at the TELBE THz facility
Ms Ekaterina Zapolnova (DESY)
Free Electron Laser in Hamburg (FLASH) employs a unique FEL scheme which provides naturally synchronized X-ray and intense THz pulses, generated from the same electron bunch, enabling the performance of exciting THz-XUV pump-probe experiments. Characterization of the spectrum has a high priority in many experiments. We have designed a spectrometer to characterize the broadband intense THz...
Mr Mohammed bawatna (HZDR)
Towards FPGA-based high speed data aquisition with online analysis
Dr Andriy Ushakov (Application engineer)
Dr Klaus Zenker (HZDR)
Tino Lang (FS-LA)
26. A new approach to femtosecond level intrinsic synchronization between accelerators and external laser systems
Mr Min Chen (Helmholtz - Zentrum Dresden - Rossendorf)
The timing jitter between accelerator-based light sources and external laser systems is nowadays the critical limit for the achievable temporal resolution in ultrafast time-resolved experiments at 4th generation light sources such as superradiant terahertz (TELBE) facilities or X-FEL's. In this work we demonstrate the proof-of-principle experiment. It was experimentally shown that our scheme...
Dr Andriy Ushakov (Application engineer)
Superconducting Radiofrequency Cavities as planned for BESSY-VSR or bERLinPro require a high stable RF field of the accelerating mode in order to allow as for VSR a stable RF beating scheme. Further, to ensure efficient operation at low RF power consumption, these type of cavities are operated at low coupling, i.e. narrow RF bandwidth. Hence, any disturbance to the system by unwanted cavity...
Ms Louise Springer (DESY)
Up to now the sensitivity of the field detectors for the accelerating cavitites are limited by the LLRF system and actuators to about 3fs for a bandwidth of 1 MHz. The main limitation is using digital field detection schemes, which involves front-ends, LO-generation and analog to digital converters. Within this poster the field detection method based on a suppressed carrier signal is...
Mr Jost Mueller (DESY)
Mr Matthias Reukauff (DESY)
The new PolariX TDS cavities developed in cooperation between DESY, PSI and CERN require X-Band RF front-ends for the measurement of the 12 GHz electric fields. The cavity, waveguide and klystron signals will be down-converted from 12 GHz to 3 GHz and further processed in a standard 3 GHz S-Band RF control system based on MicroTCA.4. In this poster, we will present the 9 GHz LO generation...
Dr Michael Nasse (Karlsruhe Institute of Technology)
Phase 1 of the "Ferninfrarot Linac- und Test-Experiment" (FLUTE), a 41 MeV linear accelerator, is currently in commissioning at KIT. Phase 1 comprises mainly the RF system including the LLRF system, electron gun, gun laser, timing system and various beam diagnostics elements. The current status of the commissioning is given in this contribution.
Dr Paul Goslawski (Helmholtz-Zentrum Berlin, HZB)