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

Takahisa KoyamaYasunori SenbaHiroshi YamazakiTomoyuki TakeuchiMasayuki TanakaYasuhiro ShimizuKoji TsubotaYasuhisa MatsuzakiHikaru KishimotoTakanori MiuraSatsuki ShimizuTakamitsu SaitoHirokatsu YumotoKentaro UesugiMasato HoshinoJumpei YamadaTaito OsakaMichihiro SugaharaNobuteru NariyamaYasuhide IshizawaHiroko NakanoChoji SajiKyo NakajimaKoji MotomuraYasumasa JotiMakina YabashiHaruhiko Ohashi
Published in: Journal of synchrotron radiation (2022)
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/B 4 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.
Keyphrases
  • high resolution
  • dual energy
  • high speed
  • computed tomography
  • electron microscopy
  • atomic force microscopy
  • room temperature
  • mass spectrometry
  • living cells
  • magnetic resonance imaging
  • monte carlo
  • fluorescent probe