Physical Review Accelerators and Beams (Nov 2024)

X-ray diagnostics for the cavity-based x-ray free-electron laser project

  • Peifan Liu,
  • Paresh Pradhan,
  • Antonino Miceli,
  • Donald A. Walko,
  • Deming Shu,
  • Joseph Sullivan,
  • Keenan Lang,
  • Mark Rivers,
  • Mario Balcazar,
  • Kenan Li,
  • Rachel Margraf,
  • Aliaksei Halavanau,
  • Anne Sakdinawat,
  • Takahiro Sato,
  • Diling Zhu,
  • Yuri Shvyd’ko

DOI
https://doi.org/10.1103/PhysRevAccelBeams.27.110701
Journal volume & issue
Vol. 27, no. 11
p. 110701

Abstract

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The success of x-ray free-electron lasers (XFELs) in recent years has greatly advanced many scientific fields. However, most of these XFELs suffer from a low longitudinal coherence and instabilities due to the stochastic start-up process. A cavity-based x-ray free-electron laser (CBXFEL) is a possible future direction in the development of fully coherent and stable x-ray sources. One of the challenges of a CBXFEL is the requirement for the μm-sized electron bunches to fully overlap in three dimensions with the circulating μm-sized x-ray pulses in an x-ray cavity tens or hundreds of meters long. We present here the development of an x-ray diagnostics system for accurate alignment of x-ray beams in the CBXFEL cavity. The system was developed within the framework of a CBXFEL research and development collaboration among Argonne National Laboratory, SLAC National Accelerator Laboratory, and Spring-8. All the designed diagnostic components have been fully characterized at the Advanced Photon Source to demonstrate a capability for sub-μrad angular and μm spatial alignment of the CBXFEL cavity.