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Distinctive features in neutronic performance of JSNS

JSNSの中性子性能の際立つ特徴

前川 藤夫; 及川 健一; 原田 正英; 勅使河原 誠; 甲斐 哲也  ; 春日井 好己; 明午 伸一郎  ; 大井 元貴; 二川 正敏; 渡辺 昇*; 梶本 亮一  ; 中村 充孝; 鳥居 周輝*; 神山 崇

Maekawa, Fujio; Oikawa, Kenichi; Harada, Masahide; Teshigawara, Makoto; Kai, Tetsuya; Kasugai, Yoshimi; Meigo, Shinichiro; Oi, Motoki; Futakawa, Masatoshi; Watanabe, Noboru*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Torii, Shuki*; Kamiyama, Takashi

JSNSの中性子性能の確認を行った。おもにNOBORU装置を、そして必要に応じて他装置も使用し、以下を確認した。(1)測定したスペクトル形状から判断し、水素モデレータ中のパラ水素割合が予測どおりほぼ1であった。これは、水素循環系に変換触媒を導入したことによる。(2)絶対スペクトル強度とパルス形状は、シミュレーション計算値とよく一致した。粉末回折装置SuperHRPDにおいて、世界最高分解能である0.035%を確認した。(4)チョッパー装置である四季において、1MW出力換算で3$$times$$10$$^{9}$$n/s/cm$$^{2}$$の中性子束を観測した。これは既存の核破砕中性子源では世界最高であり、時間平均強度においても強力な原子炉中性子源の値と肩を並べるものである。

Efforts have been made to characterize neutronic performance of JSNS. A NOBORU instrument was mainly used for this purpose while some other instruments were used when needed. The followings were confirmed. (1) Judging from a measured spectral shape, a para-hydrogen fraction in the hydrogen moderator was very close to unity as expected due to introduction of catalyst in a hydrogen circulation system. (2) Measured data for absolute spectral intensity and pulse shapes agreed very well with simulation calculations, and suggested adequacy of the neutron source designs. (3) The world's highest resolution of 0.035 % was recorded at the powder diffractometer SuperHRPD. (4) A total neutron flux of 3 $$times$$ 10$$^{9}$$n/s/cm$$^{2}$$ was confirmed at the chopper instrument 4SEASONS when it was normalized to 1 MW. The flux is the world's highest among existing spallation neutron sources, and is comparable to fluxes at intense reactor sources even in time-averaged value.

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