Author: Ko, I.S.
Paper Title Page
WEOA01
Femtosecond Synchronization of PAL-XFEL  
 
  • C. Kim, H.-S. Kang, I.S. Ko, C.-K. Min
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  The PAL-XFEL achieved a 20 fs jitter in the bunch arrival time at the end of undulators and its pump-probe system, which is extremely useful for maintaining a high stability of machine and time-resolved experiments with high time resolution. A low phase noise timing system and high stability high power RF system enable this low jitter. The measurement result shows 10 fs jitter of bunch arrival time at the injector and it increased ~ 20 fs due to the bunch energy variation. The possibility of improving the final jitter is described based on the optimization of bunch compressors and a longitudinal feedback.  
slides icon Slides WEOA01 [9.603 MB]  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPA16 Micro-Bunching Instability Monitor for X-ray Free Electron Laser 404
 
  • C. Kim, H.-S. Kang, G. Kim, I.S. Ko
    PAL, Pohang, Kyungbuk, Republic of Korea
  • J.H. Ko
    POSTECH, Pohang, Kyungbuk, Republic of Korea
 
  A direct method was developed to measure the micro-bunching instability in the X-ray Free Electron Laser (XFEL). The micro-bunching instability comes from the interaction between the electron beam and the coherent synchrotron radiation (CSR), and the FEL intensity can be affected significantly by the micro-bunching instability. However, no effective method had been introduced to monitor the micro-bunching instability, so that we installed a CCD camera to measure the micro-bunching instability after the bunch compressor. The CCD camera showed the micro-bunching instability successfully, and more interesting features of the micro-bunching instability were revealed from it.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA16  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)