Systematic investigation of the formation behavior of helium bubbles in tungsten
Systematic investigation of the formation behavior of helium bubbles in tungsten
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DOI：
10.1016/j.jnucmat.2014.10.098
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发表时间：
2015-08
影响因子：
3.1
通讯作者：
M. Miyamoto;S. Mikami;H. Nagashima;N. Iijima;D. Nishijima;R. Doerner;N. Yoshida;Hideo Watanabe;Y. Ueda;A. Sagara
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文献类型：
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作者：
M. Miyamoto;S. Mikami;H. Nagashima;N. Iijima;D. Nishijima;R. Doerner;N. Yoshida;Hideo Watanabe;Y. Ueda;A. Sagara
在线性导流器等离子体模拟器PISCES-A中，在不同温度（523-973 K）下，利用低能量（~ 50 eV）、宽影响范围（~ 1023 ~ 1026m−2）的He+离子，系统地研究了He等离子体暴露下钨中He气泡的形成。用FIB对暴露的W样品进行减薄后的TEM观察发现，He气泡的层厚（bbb30 nm）大大超出了离子注入范围几nm，随着样品温度的升高，He气泡的尺寸逐渐增大，在973 K时He气泡约为10 nm，而在<773 K时He气泡仅为1-2 nm。此外，为了获得初始形成行为的信息，还进行了He离子辐照过程中的原位TEM观测。
The formation of He bubbles in tungsten under exposure to a He plasma was systematically investigated using low energy (∼50 eV) He+ions with a wide fluence range (∼1023to 1026m−2) in the linear divertor plasma simulator PISCES-A at several temperatures (523–973 K). TEM observations after thinning exposed W samples with FIB revealed that the layer thickness (>30 nm) of He bubbles largely exceeds the ion implantation range of a few nm. The size of He bubbles was found to increase with an increase in the sample temperature: it was around 10 nm at 973 K, while only small He bubbles of 1–2 nm were observed at <773 K. In addition, to obtain information on the initial formation behavior, in-situ TEM observations during He ion irradiation were also performed.