Physical Review Accelerators and Beams (Aug 2022)

Slice energy spread measurement in the low energy photoinjector

  • Houjun Qian,
  • Mikhail Krasilnikov,
  • Anusorn Lueangaramwong,
  • Xiangkun Li,
  • Osip Lishilin,
  • Zakaria Aboulbanine,
  • Gowri Adhikari,
  • Namra Aftab,
  • Prach Boonpornprasert,
  • Georgi Georgiev,
  • James Good,
  • Matthias Gross,
  • Christian Koschitzki,
  • Raffael Niemczyk,
  • Anne Oppelt,
  • Guan Shu,
  • Frank Stephan,
  • Grygorii Vashchenko,
  • Tobias Weilbach

DOI
https://doi.org/10.1103/PhysRevAccelBeams.25.083401
Journal volume & issue
Vol. 25, no. 8
p. 083401

Abstract

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Slice energy spread is one of the key parameters in free electron laser optimizations, but its accurate measurement is not straightforward. Two recent studies from high energy (≥100 MeV) photoinjectors at SwissFEL and European x-ray free electron laser (XFEL) have reported much higher slice energy spread than expected at their XFEL working points (200–250 pC). In this paper, a new method for measuring slice energy spread at lower beam energy (∼20 MeV) is proposed and demonstrated at the PhotoInjector Test facility at DESY Zeuthen, and the results for 250 pC are much lower than those measured at high energy injectors.