Erosion of nanostructured tungsten by laser ablation, sputtering and arcing
Erosion of nanostructured tungsten by laser ablation, sputtering and arcing
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DOI：
10.1016/j.nme.2017.03.004
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发表时间：
2017-08
影响因子：
2.6
通讯作者：
D. Hwangbo;Shota Kawaguchi;S. Kajita;N. Ohno
中科院分区：
文献类型：
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作者：
D. Hwangbo;Shota Kawaguchi;S. Kajita;N. Ohno
研究了氦等离子体辐照纳米结构钨在激光烧蚀、溅射和电弧作用下的质量损失。在氦溅射能量阈值（<117 eV）以下，由诸如氮和氧的杂质气体进行的溅射占主导地位。随着入射离子能量的增加，溅射产额逐渐接近理论值，当入射离子能量大于200 eV时，氦离子溅射产额成为主要贡献。观察到在纳米结构表面上的溅射减少。使用激光脉冲引发电弧，并测量电弧的侵蚀速率。烧蚀率随电弧电流的增大而增大，而单位库仑烧蚀量不受电弧电流的影响。
Mass loss of nanostructured tungsten, which was formed by helium plasma irradiation, due to laser ablation, sputtering, and arcing was investigated. Below the helium sputtering energy threshold (<117 eV), sputtering by impurity gases such as nitrogen and oxygen was dominant. Sputtering yield became closer to theoretical value with increasing the incident ion energy, and sputtering by helium ions became the major contribution when the energy was >200 eV. Reduction in sputtering on nanostructured surface was observed. Arcing was initiated using laser pulses, and the erosion rate by arcing was measured. The erosion rate increased with arc current, while the erosion per Coulomb was not affected by arc current.