Dynamic mixing effects on hydrogen diffusion and retention in high Z materials

采用氢碳混合离子束辐照钨，研究了钨碳层动态混合对发泡和氢扩散特性的影响。结果发现，只有0.3%的碳或更强的碳促进了起泡。在钨表面形成的钨和碳的混合层起到了氢发射屏障的作用，促进了氢向体相的扩散，导致了气泡的形成。除了碳以外，在离子束中还加入了熔融反应的灰烬氦，以研究氦对钨中氢行为的影响。只有0.1%的氦添加抑制了水泡的形成。在聚变反应堆中，聚变中子被照射到容器材料中。快中子会在这些材料中产生损害。因此，研究这种辐照损伤对钨中氢行为的影响具有重要意义。为了研究这一问题，在混合离子束辐照之前，先对钨进行700keV的氢负离子束辐照。结果表明，高能氢离子束预辐照抑制了小尺寸(~lt；10μm)水泡的产生。在未来，还将研究重复热负荷的影响。

Hydrogen and carbon mixed ion beam was irradiated to tungsten to study the effects of dynamic mixing of tungsten and carbon layer on blistering and hydrogen diffusion characteristics. It was found that only 0.3% of carbon or more strongly enhanced blistering. Tungsten and carbon mixed layer formed on the tungsten surface acted as hydrogen emission barrier and enhanced hydrogen diffusion toward bulk, leading to blister formation. In addition to carbon, ash of fusion reaction, helium, was added to the ion beam to study the effect of helium on hydrogen behavior in tungsten. Only 0.1% of helium addition suppressed blister formation. In fusion reactors, fusion neutrons are irradiated to in vessel materials. Fast neutrons produce damages in these materials. Therefore it is important to study the effects of this irradiation damage on hydrogen behavior in tungsten. To study this subject, 700 keV hydrogen negative ion beam was irradiated to tungsten before mixed ion beam irradiation. It was found that pre irradiation of high energy hydrogen ion beam suppressed the production of small size (<10μm) blisters. In future, the effects of repetitive heat load will also investigated.