Simulation of arc crater formation and evolution on plasma facing materials
Simulation of arc crater formation and evolution on plasma facing materials
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等离子体表面材料上电弧坑形成和演化的模拟
DOI：
10.1016/j.nme.2021.100964
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发表时间：
2021-06
期刊：
影响因子：
--
通讯作者：
Junling Chen
中科院分区：
文献类型：
--
作者：
Baoguo Wang;Dahuan Zhu;Rui Ding;Volker Rohde C;Changjun Li;Junling Chen
托卡马克装置中等离子体表面材料的电弧侵蚀是等离子体中杂质和粉尘的潜在来源。采用具有传热、流体力学、相变和表面张力效应的二维轴对称COMSOL模型，描述了等离子体表面材料上弧坑的形成和演化过程。详细叙述了钨阴极电弧坑的形成和演化过程。能量流载荷使中心区域在几纳秒内熔化。由于入射压力的梯度，熔化层被挤出，从而形成熔体射流。讨论了在相同压力和能量流密度下，托卡马克中几种相关材料上的电弧坑的差异。W和Mo的熔坑温度远高于Cu和Al，难熔金属W和Mo的熔化体积明显低于Cu和Al，难熔金属更不易被电弧破坏，更适合作为等离子体表面材料。
Arc erosion on plasma facing materials in tokamak devices is a potential source of impurities and dust in plasma. A two dimensional axially symmetric COMSOL model with heat transfer, fluid dynamics including phase transition and surface tension effect has been used to describe the formation and evolution of arc craters on plasma facing materials. The formation and evolution of arc crater on W cathode is described in detail. The energy flux loading causes melting of central area within a few nanoseconds. Due to the gradients of incident pressure, the melted layer is extruded out, and thus forms the melt jets. The differences of the arc craters on several related materials in tokamaks under the same pressure and energy flux density are also discussed. The crater temperature of W and Mo is much higher than that of Cu and Al. And, the melting volume of refractory metals W and Mo is significantly lower than that of Cu and Al. Refractory metals are more difficult to be damaged by the arcs, and more suitable for plasma facing materials.
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DOI：
10.1088/1361-6463/aaeac0
发表时间：
2018-11
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
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影响因子：
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影响因子：
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影响因子：
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