Experimental check of neoclassical predictions for the radial electric field in a stellarator
Experimental check of neoclassical predictions for the radial electric field in a stellarator
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DOI：
10.1088/0029-5515/43/10/l02
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发表时间：
2003-10-01
期刊：
影响因子：
3.3
通讯作者：
Klinger, T
中科院分区：
文献类型：
--
作者：
Ehmler, H;Turkin, Y;Klinger, T
在仿星器温德尔斯坦7-AS上利用基于高能Li束诊断（Li-CXS）的高空间分辨率电荷交换光谱法对径向电场进行了研究。为了评估电场，使用径向力平衡方程以及测量的碳杂质的极向速度、密度和温度的剖面。实验结果与新古典理论的预测进行了比较。我们还使用了一个简单的解析近似，其中径向电场是成比例的散装等离子体的H+离子的压力梯度。这种近似与测量和精确的新古典计算都相当吻合，因此可以用于快速估计径向电场。
Investigations of the radial electric field have been carried out at the Stellarator Wendelstein 7-AS using charge-exchange spectroscopy with high spatial resolution based on the high-energy Li beam diagnostic (Li-CXS). To evaluate the electric field, the radial force balance equation is used together with the measured profiles of poloidal velocity, density and the temperature of carbon impurities. Results of experiments are compared with predictions of the neoclassical theory. We also use a simple analytic approximation, in which the radial electric field is proportional to the pressure gradient of H+ ions of the bulk plasma. This approximation agrees reasonably well with both the measurements and the accurate neoclassical calculations and, therefore, can be used for a fast estimation of the radial electric field.