Interpretation of ion flux and electron temperature profiles at the JET divertor target during high recycling and detached discharges
Interpretation of ion flux and electron temperature profiles at the JET divertor target during high recycling and detached discharges
复制标题
高回收和分离放电期间 JET 偏滤器目标处的离子通量和电子温度分布的解释
DOI：
10.1016/s0022-3115(97)80071-2
复制
发表时间：
1997
影响因子：
3.1
通讯作者：
P. Stangeby
中科院分区：
文献类型：
--
作者：
R. Monk;A. Loarte;A. Chankin;S. Clement;S. Davies;J. Ehrenberg;Houyang Y Guo;J. Lingertat;G. Matthews;M. Stamp;P. Stangeby
利用JET Mark 1泵浦的偏滤器进行了详细的实验，以表征高循环和分离的等离子体区域。本文提出了一种新的高分辨率偏滤器离子通量分布的测量方法，它可以识别在高循环放电过程中额外的峰的增长。这些离子通量分布与Dα和中性通量测量相结合，用于检验偏滤器脱离的物理过程，并与简单的分析模型进行比较。最后，指出了高循环条件下常规单探头和三探头解释方法存在的问题。通过假设单探头表现为不对称的双探头，可以拟合整个特性，并且当电子与离子饱和电流比减小时，电子温度可以得到显着降低。非对称双探头拟合的结果与独立的诊断测量结果相一致。
Detailed experiments have been carried out with the JET Mark 1 pumped divertor to characterise high recycling and detached plasma regimes. This paper presents new measurements of high resolution divertor ion flux profiles that identify the growth of additional peaks during high recycling discharges. These ion flux profiles are used in conjunction with Dα and neutral flux measurements to examine the physics of divertor detachment and compare against simple analytic models. Finally, problems are highlighted with conventional methods of single and triple probe interpretation under high recycling conditions. By assuming that the single probe behaves as an asymmetric double probe the whole characteristic may be fitted and significantly lower electron temperatures may be derived when the electron to ion saturation current ratio is reduced. The results from the asymmetric double probe fit are shown to be consistent with independent diagnostic measurements.