【摘要】 在EAST装置中利用材料与等离子体测试平台MAPES对不同表面性质和结构的钨样品进行了边缘等离子体条件下的起弧诱导实验研究。结果显示只有纳米丝结构的钨表面成功产生了电弧，表明了钨表面的纳米丝结构更有利于电弧的触发，甚至在装置远离刮削层区域的地方也能诱导电弧触发。在纳米丝钨表面起弧过程中会产生两种不同的电弧，其中较强电弧能产生熔坑，并溅射出液滴，是等离子体中尘埃及杂质的重要来源。弧坑直径约为3μm，深度约为0.7μm，在电弧熔坑中心区域形成了一些小孔和纳米结构，其周围的熔化液滴也存在类似的结构。更多还原

【Abstract】 Arc induced triggering on tungsten samples with different surface properties and structures was studied in EAST using Material and Plasma Evaluation System(MAPES). The effect of depositions on arc triggering is studied using several kinds of coatings on tungsten and the fuzz structure is generated on tungsten surface by He+ plasma in ICP irradiation system. The results show that only the tungsten surface with the fuzz structure successfully triggers arcs, which proves that the fuzz structure on tungsten surface is more conducive to ignite arcs than coated tungsten, even far away from the SOL. There are two kinds of arcs on the tungsten fuzz structure, small arc trace and deep arc crater, in which the crater produced by stronger arcs will splash liquid droplets that are important sources of impurity and dust in plasma. The diameter and depth of the crater are about 3μm and 0.7μm, respectively. Some small holes and nanostructures are formed in the center of the arc crater, and the molten droplets around them have similar structures.更多还原