Author: Min, C.-K.
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.  
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WEPA15 Development of BAM Electronics in PAL-XFEL 400
 
  • D.C. Shin, J.H. Hong, H.-S. Kang, C. Kim, G. Kim, C.-K. Min
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  We describe an electronics for electron bunch arrival time monitor (BAM) with a less than 10 femtosecond resolution, which was developed in 2017 and is currently in use at PAL-XFEL. When electron bunches go through an S-band monopole cavity, about 1 us long RF signal can be obtained to compare with a low phase noise RF reference. The differential phase jitter corresponds to the arrival time jitter of electron bunches. RF front-end (F/E) which converts the S-band pickup signal to intermediate frequency (IF) signal, is the essential part of a good time resolution. The digitizer and the signal processor of the BAM electronics are installed in an MTCA platform. This paper presents the design scheme, test results of the BAM electronics and future improvement plans.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA15  
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