Keyword: FEL
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MOPG01 Design, Production and Tests of Button Type BPM for TAC-TARLA IR FEL Facility electron, simulation, radiation, impedance 27
  • M.T. Gundogan, O. Yavaş
    Ankara University, Faculty of Engineering, Tandogan, Ankara, Turkey
  • A.A. Aydin, E. Kasap
    Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey
  • Ç. Kaya
    Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
  Funding: Ankara University
Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) facility is proposed as an IR FEL and Bremsstrahlung facility as the first facility of Turkish Accelerator Center (TAC) in Golbasi Campus of Ankara University. TARLA is proposed to generate oscillator mode FEL in 3-250 microns wavelengths range and Bremsstrahlung radiation. It will consist of normal conducting injector system with 250 keV beam energy and two superconducting RF accelerating modules in order to accelerate the beam 15-40 MeV. The electron beam will be in both continuous wave (CW) and macro pulse (MP) modes. The bunch charge will be limited by 77pC and the average beam current will be 1 mA. To detect electron beam position inside beam line, BPM (Beam Position Monitor) has to use through beam line. Wall current monitor based systems button type TARLA BPM are briefly mentioned. In this study, simulation results of the calculations in CST, production and test studies for button type TARLA BPMs are presented. Mechanical and electronic designs, antenna simulations, and the latest testing procedures are determined for button type BPMs.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG01  
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MOPG50 Deflecting Cavity Dynamics for Time-Resolved Machine Studies of SXFEL User Facility electron, cavity, diagnostics, simulation 169
  • M. Song, H.X. Deng, B. Liu, D. Wang
    SINAP, Shanghai, People's Republic of China
  Radio frequency deflectors are widely used for time-resolved beam energy, emittance and radiation profile measurements in modern free electron laser facilities. Here, we present the beam dynamics aspects of the deflecting cavity of SXFEL user facility. With a targeted time resolution around 10 fs, it is expected to be an important tool for time-resolved machine studies for SXFEL user facility.  
poster icon Poster MOPG50 [1.676 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG50  
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MOPG52 Simulation of THz Streak Camera Performance for Femtosecond FEL Pulse Length Measurement electron, simulation, photon, laser 176
  • I. Gorgisyan, R. Ischebeck, P.N. Juranič, E. Prat, S. Reiche
    PSI, Villigen PSI, Switzerland
  • I. Gorgisyan
    EPFL, Lausanne, Switzerland
  Measurement of the temporal duration of FEL pulses is important both for the operators to monitor the performance of the machine and the users performing pump-probe measurements with FEL beam. The light-field streak camera is a promising methods for the photon pulse length measurement that uses the electric field of an IR/THz laser to streak the photoelectrons*. This contribution presents a simulation of the performance of a streak camera using a single-cycle THz pulse**. The simulation recreates the photoionization process and generates electron spectra in presence of the THz field and without it. Using these spectra the photon pulse lengths are calculated and compared to the initial values. Most of the parameters used in the simulation are chosen based on experiments performed earlier.*** This contribution presents the simulation method and the obtained results. It validates the pulse length calculation analysis method and estimates the expected measurement accuracy and precision for the THz streak camera measurement technique. The simulations were done for different FEL pulse lengths ranging from about 1 fs to 40 fs both in soft and hard X-ray range.
*J. Itatani et al, PRL 88,2002
*U. Fruhling et al, N. Phot. 3,2009
**I. Gorgisyan et al, JSR 3,2016
***P. N. Juranic et al, Opt. Exp. 22,2014
***P. N. Juranic et al, J. Inst. 9,2014
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG52  
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MOPG66 Design and Experimental Tests of the SwissFEL Wire-Scanners electron, vacuum, operation, radiation 225
  • G.L. Orlandi, R. Ischebeck, C. Ozkan Loch, V. Schlott
    PSI, Villigen PSI, Switzerland
  • M. Ferianis, G. Penco
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  The SwissFEL wire-scanner (WSC) composes of an in-vacuum beam-probe - motorized by a stepper motor - and an out-vacuum pick-up of the wire-signal. In SwissFEL, WSCs will absolve two main tasks: high precision measurement of the beam profile for determining the beam emittance as a complement to view-screens; routine monitoring of the beam profile under FEL operations. In order to fulfill the aforementioned tasks, the design of the in-vacuum component of the SwissFEL WSCs followed the guidelines to ensure a mechanical stability of the scanning wire at the micrometer level as well as a significative containment of the radiation-dose release along the machine thanks to the choice of metallic wires with low density and Atomic number. Beam-loss monitors have been suitably designed to ensure a sufficient sensitivity and dynamics to detect signals from scanned beams in the charge range 10-200 pC. The design, the prototyping phases, the bench and electron-beam tests - performed at SITF (Paul Scherrer Institut) and FERMI (Elettra, Trieste) - of the entire SwissFEL WSC set-up will be presented.
Contribution accepted for publication in Physical Review Accelerators and Beams
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG66  
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  • L.W. Lai, F.Z. Chen, Z.C. Chen, Y.B. Leng, Y.B. Yan, W.M. Zhou
    SSRF, Shanghai, People's Republic of China
  • J. Chen
    SINAP, Shanghai, People's Republic of China
  Funding: Work supported by National Natural Science Foundation (No.11305253, 11575282)
During the past several years a digital BPM (DBPM) processor has been developed at the SINAP. After continuous development and optimization, the processor has been finalized and has come to batch application on the signal processing of cavity BPMs and stripline BPMs at the Dalian Coherent Light Source (DCLS) and the Shanghai Soft X-ray FEL (SXFEL). Tests have been done to evaluate the performances, such as the noise level, the SNR and the cross talk. The system resolution of the cavity and stripline BPMs can achieve 1um and 10um respectively. The test results on the Shanghai Deep-Ultra-Violet (SDUV) and the DCLS will be introduced.
poster icon Poster WEPG17 [6.500 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG17  
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WEPG18 Cavity BPM System for DCLS cavity, electron, pick-up, undulator 661
  • J. Chen, J. Chen, L.W. Lai, Y.B. Yan, L.Y. Yu, R.X. Yuan
    SINAP, Shanghai, People's Republic of China
  • Y.B. Leng
    SSRF, Shanghai, People's Republic of China
  Dalian Coherent Light Source (DCLS) is a new FEL fa-cility under construction in China. Cavity beam position monitor (CBPM) is employed to measure the transverse position with a micron level resolution requirement in the undulator section. The design of cavity, RF front end and data acquisition (DAQ) system will be introduced in this paper. The preliminary measurement result with beam at Shanghai Deep ultraviolet (SDUV) FEL facility will be addressed as well.  
poster icon Poster WEPG18 [2.962 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG18  
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WEPG52 Laser Arrival Time Measurement and Correction for the SwissFEL Lasers laser, timing, gun, experiment 763
  • M.C. Divall, C.P. Hauri, S. Hunziker, A. Romann, A. Trisorio
    PSI, Villigen PSI, Switzerland
  SwissFEL will ultimately produce sub-fs X-ray pulses. Both the photo-injector laser and the pump lasers used for the experimental end stations therefore have tight requirements for relative arrival time to the machine and the X-rays. The gun laser oscillator delivers excellent jitter performance at ~20fs integrated from 10Hz-10MHz. The Yb:CaF2 regenerative amplifier, with an over 1km total propagation path, calls for active control of the laser arrival time. This is achieved by balanced cross-correlation against the oscillator pulses and a translation stage before amplification. The experimental laser, based on Ti:sapphire laser technology will use a spectrally resolved cross-correlator to determine relative jitter between the optical reference and the laser, with fs resolution. To be able to perform fs resolution pump-probe measurements the laser has to be timed with the X-rays with <10fs accuracy. These systems will be integrated into the machine timing and complemented by electron bunch and X-ray timing tools. Here we present the overall concept and the first results obtained on the existing laser systems.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG52  
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THAL01 PALM Concepts and Considerations electron, laser, photon, free-electron-laser 848
  • P.N. Juranič, R. Abela, I. Gorgisyan, C.P. Hauri, R. Ischebeck, B. Monoszlai, L. Patthey, C. Pradervand, M. Radović, L. Rivkin, V. Schlott, A.G. Stepanov
    PSI, Villigen PSI, Switzerland
  • C.P. Hauri, L. Rivkin
    EPFL, Lausanne, Switzerland
  • R. Ivanov, P. Peier
    DESY, Hamburg, Germany
  • J. Liu
    XFEL. EU, Hamburg, Germany
  • K. Ogawa, T. Togashi, M. Yabashi
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  • S. Owada
    JASRI/RIKEN, Hyogo, Japan
  The Photon Arrival and Length Monitor (PALM), a THz streak camera device developed by PSI for non-destructive hard x-ray measurements of photon pulse length and arrival time versus a pump laser*, was brought to the SACLA XFEL** in Japan in a cross-calibration temporal diagnostics campaign after an initial experiment where only the PALM was being used***. The device was used with 9 keV pink beam and a 9.0 and 8.8 keV two-color mode, successfully measuring the arrival time and pulse lengths for several different FEL operating conditions. The device has shown itself to be very robust and transparent to the FEL beam, with temporal characterization accuracies of 15 fs or better. SwissFEL will employ two such devices at the end stations for use by both operators and experimenters to improve the operation of the FEL and to better interpret experimental data. This report presents the PALM and its uses and capabilities, and discusses the results from the SACLA cross-calibration experiments.
* P. N. Juranic et. al, Journal of Instrumentation (2014) 9.
** T. Ishikawa et. al., Nature Photonics (2012) 6(8).
*** P. N. Juranic et. al., Optics Express (2014) 22.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-THAL01  
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