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

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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