Fusion neutron effects; Estimation using ion irradiation technique

核融合中性子効果; イオン照射手法を用いた予測

濱口 大; 安堂 正己; 谷川 博康; 笠田 竜太*; 野上 修平*; 阿部 弘亨*; 橋本 直幸*

Hamaguchi, Dai; Ando, Masami; Tanigawa, Hiroyasu; Kasada, Ryuta*; Nogami, Shuhei*; Abe, Hiroaki*; Hashimoto, Naoyuki*

イオン照射法は、原型炉ブランケット構造材料における核融合中性子照射効果を予測する手法として有効であり、照射温度や照射量の精度,自由度が高く、He効果といった核融合特有の問題への対応も可能である。一方、照射領域が照射表面から極めて浅い領域に限られるという欠点を有する。このような制限のなかで、これまで核融合照射効果予測手法の確立に向け、BA活動における日本の活動としてあげた成果について報告する。

Ion irradiation is one of a powerful method for irradiation tests because of their rapid damage production, the absence of induced radioactivity, controllable test conditions such as temperatures and doses, simultaneous introduction of damages and He gases, in order to estimate the fusion neutron irradiation effects on DEMO blanket structural materials. However, ion irradiation test is not suitable enough to acquire mechanical property degradation data since the damage layer tends to be very shallow from the surface. Despite this disadvantage, the method is still a powerful tool to understand the effects especially under high dose irradiations and also synergetic effects with He (and/or H) and damages in terms of microstructural changes. In this presentation, the recent effort on the establishment of methodologies to predict fusion neutron effects under Japanese ITER-BA activity will be reviewed, emphasizing on using the ion irradiation technique.