An experimental comparison of gross and net erosion of Mo in the DIII-D divertor
An experimental comparison of gross and net erosion of Mo in the DIII-D divertor
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DOI：
10.1016/j.jnucmat.2013.01.052
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发表时间：
2013-07
影响因子：
3.1
通讯作者：
P. Stangeby;D. Rudakov;W. Wampler;J. Brooks;N. Brooks;D. Buchenauer;J. Elder;A. Hassanein;A. Leonard;A. McLean;A. Okamoto;T. Sizyuk;J. Watkins;C. Wong
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文献类型：
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作者：
P. Stangeby;D. Rudakov;W. Wampler;J. Brooks;N. Brooks;D. Buchenauer;J. Elder;A. Hassanein;A. Leonard;A. McLean;A. Okamoto;T. Sizyuk;J. Watkins;C. Wong
实验观察到，在控制良好的等离子体条件下，与DIII-D转向器的总侵蚀相比，钼的净侵蚀显著减少。这是第一次用光谱和非光谱方法测量总侵蚀速率。在一个实验中，利用离子束分析（IBA）测量了直径1cm的mo涂层样品的净侵蚀速率为0.73±0.03nm/s。同时暴露直径为1mm的Mo样品，净侵蚀速率更高，为1.31nm/s。与大样本相比，小样本的再沉积预计可以忽略不计，净侵蚀与总侵蚀的比值估计为0.56±12%。用光谱法（386nm MoI线）测定毛速率，为2.45nm/s±因子2。实验采用REDEP/WBC侵蚀/再沉积代码包耦合ITMC-DYN混合材料代码，使用Langmuir探针数据输入OEDGE代码提供的等离子体条件进行建模。代码计算净毛比=0.46，与实验结果吻合较好。
Experimental observation of net erosion of molybdenum being significantly reduced compared to gross erosion in the divertor of DIII-D is reported for well-controlled plasma conditions. For the first time, gross erosion rates were measured by both spectroscopic and non-spectroscopic methods. In one experiment a net erosion rate of 0.73±0.03nm/s was measured using ion beam analysis (IBA) of a 1cm diameter Mo-coated sample. For a 1mm diameter Mo sample exposed at the same time the net erosion rate was higher at 1.31nm/s. For the small sample redeposition is expected to be negligible in comparison with the larger sample yielding a net to gross erosion estimate of 0.56±12%. The gross rate was also measured spectroscopically (386nm MoI line) giving 2.45nm/s±factor 2. The experiment was modeled with the REDEP/WBC erosion/redeposition code package coupled to the ITMC–DYN mixed-material code, with plasma conditions supplied by the OEDGE code using Langmuir probe data input. The code-calculated net/gross ratio is =0.46, in good agreement with experiment.