Detector system of the single-crystal time-of-flight neutron diffractometer at J-PARC/MLF

単結晶中性子回折装置千手の検出器システム

川崎 卓郎   ; 中村 龍也  ; 藤 健太郎  ; 細谷 孝明*; 及川 健一   ; 大原 高志   ; 鬼柳 亮嗣  ; 海老根 守澄 ; 美留町 厚; 坂佐井 馨  ; 曽山 和彦  ; 片桐 政樹*

Kawasaki, Takuro; Nakamura, Tatsuya; To, Kentaro; Hosoya, Takaaki*; Oikawa, Kenichi; Ohara, Takashi; Kiyanagi, Ryoji; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru; Soyama, Kazuhiko; Katagiri, Masaki*

The detector system of - a single-crystal time-of-flight neutron diffractometer - is described. is the first diffractometer employing a large-area two-dimensional wavelength shifting fibre-based scintillator detector at the Material and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. Thirty-seven detectors were installed in the instrument to cover a scattering angle of 30%. The detector modules exhibited a detector efficiency of 37-471% for thermal neutrons, a Co -ray sensitivity of 1.4-5.10.110, a background count rate of 2.1-3.81.010 cps/cm and a tolerance to stray magnetic fields up to 120 gauss. The detector exhibited stable performance under the operating conditions used, such as stable count rates over 400 days and a count temperature coefficient of -0.010.02%/C at around 20C.