Microscopic damage of metals exposed to the helium discharges in TRIAM-1M tokamak and its impact on hydrogen recycling process
Microscopic damage of metals exposed to the helium discharges in TRIAM-1M tokamak and its impact on hydrogen recycling process
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TRIAM-1M托卡马克中氦放电金属的微观损伤及其对氢回收过程的影响
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Fujiwara
中科院分区：
文献类型：
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作者：
N. Yoshida;M. Miyamoto;K. Tokunaga;H. Iwakiri;H. Wakimoto;T. Fujiwara
高能电荷交换粒子轰击面向等离子体的壁面不仅会引起表面溅射，而且由于其相当高的能量而会损坏内部材料。在燃烧等离子体的情况下，我们应该考虑氦的影响，因为众所周知，氦原子对材料损伤的影响比氢原子强得多。因此，本文研究了TRIAM-1 M中长脉冲氦等离子体放电对金属的微观损伤，并通过与氦离子辐照实验的比较，讨论了对氢回收过程的影响。相当大量的位错环和非常密集的细气泡形成的照射，而低能量的电荷交换中性氦。根据低能氦离子的辐照实验，密集氦泡的形成大大增强了氢的捕获，并使解吸困难。这些结果表明，燃烧等离子体放电过程中的氢再循环现象与氢等离子体放电实验中的氢再循环现象有很大的不同。
High-energy charge-exchange particles bombarding the plasma-facing wall may cause not only surface sputtering but also damage the materials inside due to their rather high energy. In the case of burning plasma, we should take into account the effects of helium because it is well known that helium atoms have much stronger effects on material damage than hydrogen atoms. In this paper, therefore, microscopic damage of metals exposed to long pulse discharges of helium plasma in TRIAM-1M was studied and the impact on the hydrogen recycling process was discussed by comparing it with helium ion irradiation experiments. Considerably larger amounts of dislocation loops and very dense fine bubbles were formed by the irradiation of rather low-energy charge-exchange neutrals of helium. According to the irradiation experiments with low-energy helium ions, formation of dense helium bubbles drastically enhances hydrogen trapping and makes the desorption difficult. These results indicate that the hydrogen recycling phenomenon during the burning plasma discharge must be quite different from that of the hydrogen plasma discharge experiments.