Growth annealing equilibrium of tungsten nanostructures by helium plasma irradiation in non-eroding regimes
Growth annealing equilibrium of tungsten nanostructures by helium plasma irradiation in non-eroding regimes
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DOI：
10.1016/j.jnucmat.2013.04.040
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发表时间：
2013-09
影响因子：
3.1
通讯作者：
S. Kajita;N. Ohno;M. Yajima;J. Kato
中科院分区：
文献类型：
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作者：
S. Kajita;N. Ohno;M. Yajima;J. Kato
氦等离子体照射钨导致表面形成纳米结构。另一方面，当在没有氦照射的情况下升高表面温度时，纳米结构被退火。在本研究中，在偏滤器模拟器 NAGDIS-II 中研究了钨纳米结构的形成和退火之间的边界。当表面温度为 1300-1600 K 时，到达表面的氦离子通量逐渐减少，纳米结构的生长在某个时刻终止，纳米结构开始退火。决定生长和退火之间边界的氦离子通量阈值随辐照历史的变化而变化，通量阈值在1021-1022m−2范围内。
Helium plasma irradiation to tungsten leads to the formation of nanostructures on the surface. On the other hand, when the surface temperature is raised without helium irradiation, the nanostructure is annealed out. In this study, the boundary between the formation and annealing of tungsten nanostructures are investigated in the divertor simulator NAGDIS-II. When the helium ion flux to the surface was gradually decreased at the surface temperature of 1300–1600 K, the nanostructure growth was terminated at some point, and the nanostructures started to be annealed out. The helium ion flux threshold that determines the boundary between the growth and the annealing was varied by the irradiation history, and the flux threshold was in the range of 1021–1022m−2.