Double‐multilayer monochromators for high‐energy and large‐field X‐ray imaging applications with intense pink beams at SPring‐8 BL20B2. (15th July 2022)

• Record Type: Journal Article
• Authors: Koyama, Takahisa; Senba, Yasunori; Yamazaki, Hiroshi; Takeuchi, Tomoyuki; Tanaka, Masayuki; Shimizu, Yasuhiro; Tsubota, Koji; Matsuzaki, Yasuhisa; Kishimoto, Hikaru; Miura, Takanori; Shimizu, Satsuki; Saito, Takamitsu; Yumoto, Hirokatsu; Uesugi, Kentaro; Hoshino, Masato; Yamada, Jumpei; Osaka, Taito; Sugahara, Michihiro; Nariyama, Nobuteru; Ishizawa, Yasuhide; Nakano, Hiroko; Saji, Choji; Nakajima, Kyo; Motomura, Koji; Joti, Yasumasa; Yabashi, Makina; Ohashi, Haruhiko
• Is Part Of: Journal of synchrotron radiation. Volume 29:Part 5(2022)
• Page Start: 1265
• Page End: 1272
• Publication Date: 2022-07-15
• Subjects: double‐multilayer monochromator -- multilayer mirror -- high energy -- X‐ray imaging -- large field of view; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577522006610
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Double‐multilayer monochromators for high‐energy and large‐field X‐ray imaging applications are designed, installed and evaluated at the SPring‐8 medium‐length (215 m) bending‐magnet beamline BL20B2. Abstract : 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/B4 C 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 × 10 9 photons s −1 mm −2 (6.9 × 10 10 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.