Author: Shin, J.
Paper Title Page
WEP031 Timing Synchronization Activities for Drift-Free Operation of Ultrafast Electron Diffraction System at KAERI 385
  • J. Shin, J. Kim
    KAIST, Daejeon, Republic of Korea
  • I.H. Baek, Y.U. Jeong, H.W. Kim, K. Oang, S. Park
    KAERI, Daejon, Republic of Korea
  Funding: This work is funded by KAERI (Grant number: 525350-19)
Precise timing synchronization of an ultrafast electron diffraction facility is essential requirement for femtosecond resolution structure analysis. Recent studies of THz-based electron deflectors have enabled the timing drift measurement between ultrafast electrons and an optical pump beam with few femtosecond resolution [1]. In this work, we will introduce timing synchronization activities to suppress the drift of an electron beam. As timing drift of the electron beam originates from every sub-element, each timing drift contribution from RF transfer, RF-to-optical synchronization, and optical amplification is measured. Timing drift of RF transfer through coaxial cable, which exposed to temperature fluctuation, is actively stabilized from 2 ps to 50 fs by active feedback loop. Further additive drift from RF-to-optical synchronization is maintained below 100 fs. Also optical drift due to the regenerative amplifier, measured by optical correlator, is maintained below 20 fs over an hour. This work allows ultrafast electron diffraction system to operate with less drift correction procedure and increased user availability.
[1] H. Yang et al., "10-fs-level synchronization of photocathode laser with RF-oscillator for ultrafast electron and X-ray sources", Sci. Rep. 7, 39966 (2017).
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About • paper received ※ 24 August 2019       paper accepted ※ 25 August 2019       issue date ※ 05 November 2019  
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