Recent status of a cold neutron disk chopper spectrometer AMATERAS

冷中性子ディスクチョッパー型分光器アマテラスの現状

中島 健次  ; 河村 聖子   ; 菊地 龍弥  ; 稲村 泰弘  ; 川北 至信  ; 中村 充孝   ; 梶本 亮一  ; 高田 慎一  ; 及川 健一   ; 原田 正英   

Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Inamura, Yasuhiro; Kawakita, Yukinobu; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Takata, Shinichi; Oikawa, Kenichi; Harada, Masahide

アマテラスは、J-PARCの物質・生命科学実験施設に設置された例中性子ディスクチョッパー型分光器である。MLFの大ピーク強度とパルス整形チョッパーを組み合わせ、高分解能、大強度での実験ができる装置である。2009年の初ビーム以来、装置調整、共用を続けてきた。今回の発表では、アマテラスの最新の状況を報告する。

AMATERAS is a cold-neutron multi disk-chopper spectrometer at Materials and Life Science Experimental Facility (MLF) in J-PARC. By using a pulse shaping chopper and owing to the high peak intensity from a coupled moderator source at MLF, AMATERAS is designed to realize high intensity and fine and flexible energy resolution measurements in quasielastic and inelastic neutron scattering experiments from cold to thermal neutron energy region. The spectrometer has had the first neutron beam in May 2009 and had the first user in December 2009. The user program on AMATERAS is running successfully for 5 years. Until June, 2014, experiments of 61 general proposals have been carried out, which have resulted more than 20 papers, 5 theses and nearly a hundred of presentations at scientific meetings. In parallel to the user program, machine study and commissioning work to improve spectrometer performance have been continuously done. Recently, we have finished refurbishment of the beam transport section. Also, there is a progress in background reduction work, development of data analysis method and preparation in sample environments. In this presentation, we will present the current status of AMATERAS together with ideas of future upgrade plans.