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 37-47
1% for thermal neutrons, a
Co
-ray sensitivity of 1.4-5.1
0.1
10
, a background count rate of 2.1-3.8
1.0
10
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 -0.01
0.02%/
C at around 20
C.