Net versus gross erosion of high-Z materials in the divertor of DIII-D
Net versus gross erosion of high-Z materials in the divertor of DIII-D
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DOI：
10.1088/0031-8949/2014/t159/014030
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发表时间：
2014-04
期刊：
影响因子：
2.9
通讯作者：
D. Rudakov;P. Stangeby;W. Wampler;J. Brooks;N. Brooks;J. Elder;A. Hassanein;A. Leonard;A. Mclean;R. Moyer;T. Sizyuk;J. Watkins;C. Wong
中科院分区：
文献类型：
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作者：
D. Rudakov;P. Stangeby;W. Wampler;J. Brooks;N. Brooks;J. Elder;A. Hassanein;A. Leonard;A. Mclean;R. Moyer;T. Sizyuk;J. Watkins;C. Wong
在DIII-D下偏滤器中使用偏滤器材料评价系统进行的实验中，观察到钼和钨的净侵蚀与严重侵蚀相比有很大的减少。用卢瑟福背散射法测量了曝光后钼和钨薄膜的净侵蚀，得出钼的净侵蚀速率为0.4~0.7 nm，W的净侵蚀速率为S−1，∼为0.14nmS−1。在直径为1 mm的样品上，用卢瑟福背散射测量了薄膜的总侵蚀，可以忽略再沉积。与Mo的∼2和W的∼3的因子相比，直径1 cm的样品上的净侵蚀减少了。实验采用REDEP/WBC侵蚀/再沉积程序包与材料和化合物中的离子传输-动力学混合材料程序相耦合，等离子体条件由洋葱皮肤建模+Eirene+DIVIMP提供，边缘建模程序由偏滤器朗缪尔探头输入。计算得到的钼和钨的净/毛冲蚀率比分别为0.46和0.33，与试验结果吻合较好。
A substantial reduction of net compared to gross erosion of molybdenum and tungsten was observed in experiments conducted in the lower divertor of DIII-D using the divertor material evaluation system. Post-exposure net erosion of molybdenum and tungsten films was measured by Rutherford backscattering (RBS) yielding net erosion rates of 0.4–0.7 nm s−1 for Mo and ∼0.14 nm s−1 for W. Gross erosion was estimated using RBS on a 1 mm diameter sample, where re-deposition is negligible. Net erosion on a 1 cm diameter sample was reduced compared to gross erosion by factors of ∼2 for Mo and ∼3 for W. The experiment was modeled with the REDEP/WBC erosion/re-deposition code package coupled to the Ion Transport in Materials and Compounds—DYNamics mixed-material code, with plasma conditions supplied by the Onion skin modeling + Eirene + Divimp for edGE modeling code with input from divertor Langmuir probes. The code-calculated net/gross erosion rate ratios of 0.46 for Mo and 0.33 for W are in agreement with the experiment.