Physical Review Accelerators and Beams (Nov 2016)

Narrow-band photon beam via laser Compton scattering in an energy recovery linac

  • T. Akagi,
  • A. Kosuge,
  • S. Araki,
  • R. Hajima,
  • Y. Honda,
  • T. Miyajima,
  • M. Mori,
  • R. Nagai,
  • N. Nakamura,
  • M. Shimada,
  • T. Shizuma,
  • N. Terunuma,
  • J. Urakawa

DOI
https://doi.org/10.1103/PhysRevAccelBeams.19.114701
Journal volume & issue
Vol. 19, no. 11
p. 114701

Abstract

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Narrow-bandwidth photon beams in the x-ray and γ-ray energy ranges are expected to be applied in various fields. An energy recovery linac (ERL)-based laser Compton scattering (LCS) source employing a laser enhancement cavity can produce a high-flux and narrow-bandwidth photon beam. We conducted the first experiment of an ERL-based LCS source in combination with a laser enhancement cavity. We obtained LCS photons with an energy of 6.95±0.01 keV by colliding an electron beam of 20 MeV with a laser of 1064 nm wavelength. The photon flux at the interaction point was evaluated to be (2.6±0.1)×10^{7} photons/s with an average beam current of 58 μA and an average laser power of 10 kW. The energy bandwidth was evaluated to be 0.4% (rms) with an opening angle of 0.14 mrad. The technologies demonstrated in this experiment are applicable for future ERL-based LCS sources.