Characteristic changes of deuterium retention on tungsten surfaces due to low-energy helium plasma pre-exposure
Characteristic changes of deuterium retention on tungsten surfaces due to low-energy helium plasma pre-exposure
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DOI：
10.1016/j.jnucmat.2004.10.011
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发表时间：
2005-03
影响因子：
3.1
通讯作者：
D. Nishijima;T. Sugimoto;H. Iwakiri;M. Ye;N. Ohno;N. Yoshida;S. Takamura
中科院分区：
文献类型：
--
作者：
D. Nishijima;T. Sugimoto;H. Iwakiri;M. Ye;N. Ohno;N. Yoshida;S. Takamura
当钨在高温（1600 K）下预暴露于低能He等离子体时，钨中的氘保留量大幅增加，而在低温（700 K）下预暴露时，氘保留量减少。氘保留率的增加可归因于在钨表面上形成的亚微米尺寸的He气泡和二次间隙缺陷。在低温He预暴露过程中He原子对陷阱位的占据会减少氘原子的有效陷阱位数，这将降低氘在钨表面上的保留。
Deuterium retention in tungsten increases substantially when it is pre-exposed to low-energy He plasma at a high temperature (1600K), while it decreases when pre-exposed at a low temperature (700K). The increase of deuterium retention could be attributed to the submicron-sized He bubbles and secondary interstitial defects formed on the tungsten surface. Occupation of trap sites by He atoms during the He pre-exposure at low temperature could decreases the effective number of available trap sites for deuterium atoms, which would decreases the deuterium retention on the tungsten surface.