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

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Abstract
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 μ m − sized electron bunches to fully overlap in three dimensions with the circulating μ m − 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- μ rad angular and μ m spatial alignment of the CBXFEL cavity. Published by the American Physical Society 2024
Funding Information
  • U.S. Department of Energy (DE-AC02-06CH11357)
  • Office of Science
  • Basic Energy Sciences (DE-AC02-76SF00515)

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