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Development of JRR-3 high-performance moderator vessel for cold neutron beam

JRR-3冷中性子減速材容器の高性能化

新居 昌至 ; 田村 格良  ; 和田 茂

Arai, Masaji; Tamura, Itaru; Wada, Shigeru

熱中性子を減速させ冷中性子に変換する減速材容器の形状は、最近では円筒型や三日月型が主流になっている。一方で、JRR-3で使用している減速材容器はステンレス鋼製の水筒型である。そのため、新たに形状及び材質を最適化することで、冷中性子のビーム強度の増強を図る。

The moderator vessel with neutron slowing-down, e.g. the spherical, ring-like annular or crescent shape, has been used recently in CNS. However, the JRR-3 CNS still has the same flat shape vessel as the ORPHEE's old type vessel, which was made from stainless steel. The improvement of JRR-3's vessel by optimizing the shape and material design increases the neutron intensity.

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