Study on hydrogen isotope behavior in metal re-deposition layer in a fusion reactor

在下一代高密度能源聚变反应堆的开发中，对燃料氚行为的理解是一个不可缺少的问题。本研究对等离子体约束容器内壁侵蚀形成的金属再沉积层中燃料氢同位素的吸附/解吸特性进行了评价。结果表明，在氢等离子体辐照下生长的金属沉积层中有相当数量的氢被捕获。氢的含量因沉积条件的不同而有很大的变化。结果表明，加热至600℃以上可回收大部分残留的氢。

In the development of a fusion reactor expected as a next generation high density energy source, the understanding of fuel tritium behavior is an indispensable problem. In the present study, the sorption/desorption characteristics evaluation of fuel hydrogen isotopes in the metal re-deposition layer formed by erosion of the inner wall of the plasma confinement vessel were performed. It was found that not a small amount of hydrogen was trapped in the metal deposition layers grown under hydrogen plasma irradiation. The amount of hydrogen greatly varied depending on the deposition condition. It was revealed that the majority of hydrogen retained can be recovered by heating to 600℃ or more.