Formation mechanism of bubbles and holes on tungsten surface with low-energy and high-flux helium plasma irradiation in NAGDIS-II
Formation mechanism of bubbles and holes on tungsten surface with low-energy and high-flux helium plasma irradiation in NAGDIS-II
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DOI：
10.1016/j.jnucmat.2004.04.129
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发表时间：
2004-08-01
影响因子：
3.1
通讯作者：
Takamura, S
中科院分区：
文献类型：
--
作者：
Nishijima, D;Ye, MY;Takamura, S
在线性偏滤器等离子体模拟器NAGDIS-II上，系统研究了能量低于30 eV、粒子流率高于10（22）m（-2）s（-1）的氦离子辐照粉末冶金钨时，微米级He气泡和空穴的形成机理。当入射氦离子能量大于5eV时，形成空穴，这可能与氦离子穿透钨的表面势垒势能有关。钨表面温度强烈影响孔的数量和尺寸。在1600 K以上，钨表面出现直径为几百纳米的气泡和/或孔洞。与粉末冶金钨相比，单晶钨具有更少的本征缺陷，也被He等离子体辐照。两种等级的钨在孔的形成方面没有质的区别。根据实验结果讨论了气泡和孔洞的形成机理。(C)2004 Elsevier B. V.保留所有权利。
A systematic study on the formation mechanism of micron-sized He bubbles and holes in powder metallurgy tungsten due to helium ion irradiation with an ion energy below 30 eV and a particle flux above 10(22) m(-2) s(-1) has been performed in the linear divertor plasma simulator NAGDIS-II. Holes are formed with incident helium ion energy above 5 eV, which could be related to the surface barrier potential energy for He penetrating into tungsten. Tungsten surface temperature strongly influences the number and size of hole. Above 1600 K, bubbles and/or holes with several hundreds nano-meter diameter appear on the tungsten surface. Single crystal tungsten, which has much fewer intrinsic defects than powder metallurgy tungsten, was also irradiated by He plasmas. There is no qualitative difference in the hole formation between the two grades of tungsten. Bubble and hole formation mechanisms are discussed based on the experimental results. (C) 2004 Elsevier B.V. All rights reserved.