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A Novel time-spatial-focusing momentum-correction analyzer for the near-backscattering spectrometer DIANA at J-PARC

Takahashi, Nobuaki; Shibata, Kaoru  ; Sato, Taku*; Arai, Masatoshi; Mezei, F.*

We have developed a novel configuration concept of crystal-chips for a time-of-flight (TOF) crystal-analyzer neutron inelastic scattering spectrometer, which simultaneously achieves time-focusing, spatial-focusing and momentum-correcting abilities. This concept will be adopted to a coming TOF near-backscattering spectrometer, DIANA which has been proposed to construct at Japan Proton Accelerator Research Complex (J-PARC). At first, layout method satisfying both of the time- and spatial-focusing concepts and momentum-correction concept have been introduced briefly, and then, the focusing performances have been evaluated by Monte-Carlo simulations. Simulations have been performed on a generally-used energy-focusing analyzer as a comparison.

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