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Recent issues of AMATERAS; A Disk-chopper spectrometer at J-PARC

冷中性子ディスクチョッパー型分光器AMATERASの近況

中島 健次  ; 河村 聖子   ; 菊地 龍弥  ; 川北 至信  ; 稲村 泰弘  ; 梶本 亮一  ; 中村 充孝   ; 青山 和弘; 神原 理*; 若井 大介*

Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Kawakita, Yukinobu; Inamura, Yasuhiro; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Aoyama, Kazuhiro; Kambara, Wataru*; Wakai, Daisuke*

AMATERASは、J-PARCの物質・生命科学実験施設(MLF)に設置された冷中性子ディスクチョッパー型分光器である。パルス整形チョッパーを持つ最初の分光器として2009年に完成、運用開始し、現在に至るまで80件以上の課題をこなし、36本以上の論文を生み出してきた。この8年間、我々はこの種のチョッパーの運用について知見と経験を積み上げてきており、他の同種の分光器にも役立つと思われるそれらについて報告する。

AMATERAS is a cold-neutron disk-chopper spectrometer at Materials and Life Science Experimental Facility (MLF) in J-PARC. As one of the first-generation disk-chopper spectrometers with a pulse shaping chopper, the spectrometer started its operation in 2009. Until May 2016, experiments of more than 80 proposals have been carried out, which have produced 36 papers, 7 theses and nearly a hundred of presentations at scientific meetings. In past 8 years, we have been accumulating experiences of operation of a pulse-shaping-type chopper spectrometer and are facing several problems with a beam-transport, back-ground, chopper operations etc. In this presentation, we will present our experiences and issues with operation of AMATERAS, which might be of help of other similar spectrometers in operation or in the planning stage.

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