Experimental validation of cold neutron source performance with mesitylene moderator installed at RANS

Yujiro Ikeda, Makoto Teshigawara, Mingfei Yan, Chihiro Iwamoto, Kunihiro Fujita, Yutaka Abe, Yasuo Wakabayashi, Atsushi Taketani, Takaoki Takanashi, M. Harada, Takao Hashiguchi, Yutaka Yamagata, Yoshio Matsuzaki, Baolong Ma, Masato Takamura, Maki Mizuta, Makoto Goto, Shota Ikeda, Tomohiro Kobayashi and Yoshie Otake

Jadavpur Journal of International Relations, 2022, vol. 24, issue 3-4, 373-383

Abstract: The RANS (RIKEN Accelerator driven Neutron Source), one of compact accelerator neutron sources (CANS), tries to expand its performance by installing a cold neutron which may provide new opportunities in many applications. RANS is a low power CANS with a proton beam of 7 MeV and 100 µA at maximum. A moderator system was constructed based on results of optimization design study with mesitylene. Recently, we have done performance tests aiming at showing characteristics as cold neutron source. Cryogenic mesitylene moderator was installed on a plug with a new target moderator reflector configuration of RANS. Experiment using a gas electron multiplier (GEM) detector was carried out to measure neutron spectra of the cold moderator. This paper describes performance of the cold moderator in terms of 1) Cold neutron gain of optimization design with respect to a polyethylene moderator, 2) Temperature dependency of cold neutron spectrum flux regarding scattering kernel (SK), and 3) comparison between experiment and calculation. A note is given for comparison between calculations with different SKs available. Also, two-dimensional imaging of cold and thermal neutron spectrum flux on the viewed surface is shown with a pinhole slit configuration.

Keywords: Cold neutron; mesitylene moderator; RANS; scattering kernel; GEM detector (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jadint:v:24:y:2022:i:3-4:p:373-383

DOI: 10.3233/JNR-220034

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