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arXiv · 1806.09752

Development of energy-resolved neutron imaging detectors at RADEN

Joseph Don Parker·Masahide Harada·Hirotoshi Hayashida·Kosuke Hiroi·Tetsuya Kai·Yoshihiro Matsumoto·Takeshi Nakatani·Kenichi Oikawa·Mariko Segawa·Takenao Shinohara·Yuhua Su·Atsushi Takada·Taito Takemura·Tomoyuki Taniguchi·Toru Tanimori·Yoshiaki Kiyanagi
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Abstract

Energy-resolved neutron imaging at a pulsed source utilizes the energy-dependent neutron transmission measured via time-of-flight to extract quantitative information about the internal microstructure of an object. At the RADEN instrument at J-PARC in Japan, we use cutting-edge detectors employing micro-pattern detectors or fast Li-glass scintillators and fast, all-digital data acquisition to perform such measurements, while continuing their development toward better utilization of the intense neutron source. In particular, for the Micro-Pixel Chamber based Neutron Imaging Detector ({\mu}NID), a micro-pattern detector with a 400 {\mu}m pitch and employing 3He for neutron conversion, we have successfully improved the spatial resolution from 200 to 100 {\mu}m, increased the detection efficiency from 18 to 26% for thermal neutrons, and increased the maximum count rate from 0.4 to 1 Mcps. We are also testing a new readout element with a 215 {\mu}m pitch for further improved spatial resolution, and a {\mu}NID with boron-based neutron converter for increased rate performance.

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Joseph Don Parker, Masahide Harada, Hirotoshi Hayashida, Kosuke Hiroi, Tetsuya Kai, Yoshihiro Matsumoto, Takeshi Nakatani, Kenichi Oikawa, Mariko Segawa, Takenao Shinohara, Yuhua Su, Atsushi Takada, Taito Takemura, Tomoyuki Taniguchi, Toru Tanimori, Yoshiaki Kiyanagi. 2018-06-26. Development of energy-resolved neutron imaging detectors at RADEN. https://doi.org/10.7566/jpscp.22.011022

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