Material probe analysis for plasma facing surface in the Large Helical Device
Material probe analysis for plasma facing surface in the Large Helical Device
复制标题
大型螺旋装置中等离子体面对表面的材料探针分析
DOI：
10.1088/0029-5515/44/4/003
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发表时间：
2004
期刊：
影响因子：
3.3
通讯作者：
O. Motojima
中科院分区：
文献类型：
--
作者：
T. Hino;A. Sagara;Y. Nobuta;N. Inoue;Y. Hirohata;Y. Yamauchi;S. Masuzaki;N. Noda;H. Suzuki;A. Komori;N. Ohyabu;O. Motojima
从第一次实验开始，在大型螺旋装置（LHD）的内壁沿极向方向安装了材料探针。在每次运动后，检测杂质沉积和气体保留，以研究等离子体表面相互作用和壁面清洁程度。在第二次战役中，通过辉光放电调理彻底清洗了整个墙壁，主放电次数增加。在第三次和第四次作业中，在整个导流器走向区域安装了石墨瓦，然后与不锈钢（SS）壁的情况相比，壁况发生了显著变化。结果表明，导流管内石墨瓦主要在主放电时被侵蚀，SS第一壁主要在辉光放电时被侵蚀。在主要排放过程中，被侵蚀的碳沉积在整个壁上。观察到等离子体中金属杂质的减少，这与炭化壁相对应。在远离等离子体的壁面处沉积厚度很大。由于整个壁被碳化，H、He等放电气体的留存量变大。特别地，氦保留在靠近阳极的位置是大的用于氦辉光放电清洗。由于壁温被限制在368 K以下，LHD壁的一个特征是大量保留氦。为了减少排放气体的再循环，需要进行壁面加热。
Material probes have been installed at the inner walls along the poloidal direction in large helical device (LHD) from the first experimental campaign. After each campaign, the impurity deposition and the gas retention have been examined to study the plasma surface interaction and the degree of wall cleaning. In the 2nd campaign, the entire wall was thoroughly cleaned by glow discharge conditioning and the number of main discharge shots increased. For the 3rd and 4th campaigns, graphite tiles were installed over the entire divertor strike region, and then the wall condition was significantly changed compared with the case of a stainless steel (SS) wall. It was seen that graphite tiles in the divertor were eroded mainly during main discharges, and the SS first wall mainly during glow discharges. During main discharges the eroded carbon was deposited on the entire wall. A reduction of metal impurities in the plasma was observed, which corresponds to the carbonized wall. The deposition thickness was great at the wall far from the plasma. Since the entire wall was carbonized, the amount of discharge gases retained such as H and He became large. In particular, helium retention was large at a position close to the anodes used for helium glow discharge cleanings. One characteristic of the LHD wall is a large retention of helium since the wall temperature is limited to below 368 K. In order to reduce the recycling of the discharge gas, wall heating is necessary.
LHD 配置的限制特性实现了最高 beta 值
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
K. Y. Watanabe;et al.
通讯作者：
et al.