Ignition and Behavior of Arc Spots under Fusion Relevant Condition
Ignition and Behavior of Arc Spots under Fusion Relevant Condition
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熔化相关条件下电弧点的点燃和行为
DOI：
10.1109/deiv.2018.8537067
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Kajita
中科院分区：
文献类型：
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作者：
S. Kajita
核聚变反应堆等离子体面元件的电弧是一个长期存在的问题。等离子体暴露和脉冲热负荷引起的表面形貌变化以及等离子体的不稳定性使其更容易点燃电弧。虽然溅射对材料的侵蚀已经有了很好的了解，但还没有提供足够的电弧数据库。本文综述了氦等离子体辐照形成的纤维状纳米结构钨的引燃电弧。单极电弧是在瞬态热负荷下被点燃的，电极材料随着电弧点在表面的移动而从表面释放出来。在氦离子辐照下沉积形成的大型纤维状纳米结构（LFNs）上点燃电弧后，大量粉尘从电弧点释放出来。这些可能是聚变装置中重要的材料侵蚀源。
Arcing on plasma facing components in nuclear fusion reactor is an longstanding issue. Surface morphology changes by plasma exposure and pulsed heat load accompanied by plasma instabilities make it easier to ignite arcing. Although material erosion by sputtering has been understood well, no sufficient database for arcing has yet to be provided. This paper summarize the arcing ignited on fiberform nanostructured tungsten formed by the exposure to helium plasmas. Unipolar arcing was ignited in response to transient heat load, and electrode material was released from the surface as arc spots moved on the surface. When arcing was ignited on large scale fiberform nanostructures (LFNs), which could be formed when deposition occurred together with helium ion irradiation, a massive amount of dusts were released from the arc spots. Those could be an important material erosion source in fusion devices.