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High peak current operation of x-ray free-electron laser multiple beam lines by suppressing coherent synchrotron radiation effects

Toru Hara1,*, Chikara Kondo2, Takahiro Inagaki1, Kazuaki Togawa1, Kenji Fukami2, Shingo Nakazawa3, Taichi Hasegawa3, Osamu Morimoto3, Masamichi Yoshioka3 et al.

Hirokazu Maesaka1, Yuji Otake1, and Hitoshi Tanaka1

  • 1RIKEN SPring-8 Center, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
  • 2Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
  • 3SPring-8 Service Co., Ltd., Kouto 1-20-5, Shingu-cho, Tatsuno, Hyogo 679-5165, Japan

  • *toru@spring8.or.jp
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Phys. Rev. Accel. Beams 21, 040701 – Published 2 April, 2018

DOI: https://doi.org/10.1103/PhysRevAccelBeams.21.040701

Abstract

The parallel operation of multiple beam lines is an important means to expand the opportunity of user experiments at x-ray free-electron laser (XFEL) facilities. At SPring-8 Angstrom free-electron laser (SACLA), the multi-beam-line operation had been tested using two beam lines, but transverse coherent synchrotron radiation (CSR) effects at a dogleg beam transport severely limited the laser performance. To suppress the CSR effects, a new beam optics based on two double bend achromat (DBA) structures was introduced for the dogleg. After the replacement of the beam optics, high peak current bunches of more than 10 kA are now stably transported through the dogleg and the laser pulse output is increased by a factor of 2–3. In the multi-beam-line operation of SACLA, the electron beam parameters, such as the beam energy and peak current, can be adjusted independently for each beam line. Thus the laser output can be optimized and wide spectral tunability is ensured for all beam lines.

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Phys. Rev. Accel. Beams 21, 040701– Published 2 April, 2018
  • Received 16 February 2018
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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