Author: Kang, H.-S.
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MOP1WA03
 PAL-XFEL and Its Time-Resolved Experiment with sub-20-fs Timing Jitter  
 
  • C.-K. Min, I. Eom, J. Hu, S.H. Jung, H.-S. Kang, S.H. Kim, H.-S. Lee, S.S. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  A tunable femtosecond X-ray laser, PAL-XFEL have sub-20- fs timing jitter between XFEL pulses and optical laser pulses, which make this machine extremely useful for time-resolved experiments with high time resolution. We describe the effort made to minimize timing jitter of XFEL machine and to synchronize optical laser system to our low phase noise RF reference. Passively stabilized RF timing distribution system and phase-locked oscillators provide 1 fs level jitter, and carefully designed LLRF and modulator system provide 10-4 level energy stability of electron bunches. The electron bunch arrival jitter is measured less than 20 fs with a phase cavity. Cross correlation between XFEL and optical laser also showed less than 20 fs timing jitter.  
slides icon Slides MOP1WA03 [14.919 MB]  
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MOP2WA04
 FEL Optimization Through BBA with Undulator Spectrum Analysis and Undulator Optics Matching  
 
  • H.-S. Kang, H. Yang
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  The use of electron-beam-based alignment incorporating undulator radiation spectrum analysis has allowed reliable operation of PAL-XFEL with unprecedented stability in terms of orbit, energy, and timing. The hard XFEL operation procedure established using e-BBA and incorporating undulator radiation spectrum analysis proved to be highly reliable and robust, and essential for the variable-gap undulators. The undulator optics matching using the wire-scanner based emittance measurement is extensively used to maximize the FEL intensity even at higher photon energy up to 14.5 keV.  
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FRA1PL01 Summary Report: Linac-Based Light Sources 199
 
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  • W. Decking
    DESY, Hamburg, Germany
  • L. Giannessi
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • L. Giannessi
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • H.-S. Kang
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  This is the summary report of the linac-based light sources working group.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-FRA1PL01  
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