利用可见轫致辐射计算EAST有效电荷数
Effective ionic charge from visible bremsstrahlung measurements on EAST
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摘要: 利用弦积分的可见轫致辐射计算了先进实验超导托卡马克(EAST)的有效电荷数。对比分析EAST硼化前后的杂质含量，硼化后有效电荷数减小约40%，碳杂质含量减小约50%。统计分析了2009年EAST春季实验的有效放电，显示有效电荷数与碳杂质线辐射量存在很强的线性关系，得到的拟合系数是3.4~5.8，与等离子体电流和低杂波辅助加热功率都有明确的依赖关系。利用近紫外可见波段全谱对主要杂质的含量进行比较后显示，碳是最主要的杂质，大于其它轻杂质含量。同时，还介绍了新建成的多道轫致辐射诊断系统。Abstract: On EAST, effective ionic charge was routinely computed from line integrated measurements of visible bremsstrahlung. Comparison between the value of effective ionic charge before and after boronization shows that the amount of impurities decreases a lot after boronization. Analysis on a large database of EAST experimental campaign 2009 shows strong linear relationship between effective ionic charge and line radiation of carbon, and the fitting factor varies from 3.4 to 5.8, depending on both plasma current and auxiliary power. The amount of main impurities were compared with each other through UV-VIS spectrum, and the result shows that carbon contributes the most to effective ionic charge than any other light impurities.
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Key words:
- effective ionic charge /
- bremsstrahlung /
- impurity /
- spectrum /
- boronization
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