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Detector system of the $$SENJU$$ 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 ${it SENJU}$ - a single-crystal time-of-flight neutron diffractometer - is described. ${it SENJU}$ 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$$pm$$1% for thermal neutrons, a $$^{60}$$Co $$gamma$$-ray sensitivity of 1.4-5.1$$pm$$0.1$$times$$10$$^{-6}$$, a background count rate of 2.1-3.8$$pm$$1.0$$times$$10$$^{-4}$$ cps/cm$$^{2}$$ 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$$pm$$0.02%/$$^{circ}$$C at around 20$$^{circ}$$C.

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パーセンタイル:16.16

分野:Instruments & Instrumentation

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