Journal of Synchrotron Radiation (Sep 2022)

Double-multilayer monochromators for high-energy and large-field X-ray imaging applications with intense pink beams at SPring-8 BL20B2

  • Takahisa Koyama,
  • Yasunori Senba,
  • Hiroshi Yamazaki,
  • Tomoyuki Takeuchi,
  • Masayuki Tanaka,
  • Yasuhiro Shimizu,
  • Koji Tsubota,
  • Yasuhisa Matsuzaki,
  • Hikaru Kishimoto,
  • Takanori Miura,
  • Satsuki Shimizu,
  • Takamitsu Saito,
  • Hirokatsu Yumoto,
  • Kentaro Uesugi,
  • Masato Hoshino,
  • Jumpei Yamada,
  • Taito Osaka,
  • Michihiro Sugahara,
  • Nobuteru Nariyama,
  • Yasuhide Ishizawa,
  • Hiroko Nakano,
  • Choji Saji,
  • Kyo Nakajima,
  • Koji Motomura,
  • Yasumasa Joti,
  • Makina Yabashi,
  • Haruhiko Ohashi

DOI
https://doi.org/10.1107/S1600577522006610
Journal volume & issue
Vol. 29, no. 5
pp. 1265 – 1272

Abstract

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In this study, double-multilayer monochromators that generate intense, high-energy, pink X-ray beams are designed, installed and evaluated at the SPring-8 medium-length (215 m) bending-magnet beamline BL20B2 for imaging applications. Two pairs of W/B4C multilayer mirrors are designed to utilize photon energies of 110 keV and 40 keV with bandwidths of 0.8% and 4.8%, respectively, which are more than 100 times larger when compared with the Si double-crystal monochromator (DCM) with a bandwidth of less than 0.01%. At an experimental hutch located 210 m away from the source, a large and uniform beam of size 14 mm (V) × 300 mm (H) [21 mm (V) × 300 mm (H)] was generated with a high flux density of 1.6 × 109 photons s−1 mm−2 (6.9 × 1010 photons s−1 mm−2) at 110 keV (40 keV), which marked a 300 (190) times increase in the photon flux when compared with a DCM with Si 511 (111) diffraction. The intense pink beams facilitate advanced X-ray imaging for large-sized objects such as fossils, rocks, organs and electronic devices with high speed and high spatial resolution.

Keywords