Plasma detachment in JET Mark I divertor experiments
Plasma detachment in JET Mark I divertor experiments
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DOI：
10.1088/0029-5515/38/3/303
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发表时间：
1998-03
期刊：
影响因子：
3.3
通讯作者：
A. Loarte;R. Monk;J. R. Martin-Solis;D. Campbell;A. Chankin;S. Clement;S. Davies;J. Ehrenberg
中科院分区：
文献类型：
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作者：
A. Loarte;R. Monk;J. R. Martin-Solis;D. Campbell;A. Chankin;S. Clement;S. Davies;J. Ehrenberg
介绍了在具有Mark I抽气偏滤器的欧洲联合环形加速器（JET）托卡马克中，在欧姆、L模和有边缘局域模的H模实验中偏滤器脱附的实验特性，主要侧重于仅用氘进行燃料注入的放电情况。将描述在各种模式下观察到偏滤器脱附的范围，以及偏滤器结构、环向场方向、偏滤器靶材和主动抽气对脱附的影响。将根据现有的等离子体脱附分析和数值模型结果，研究观察到的脱附特性，例如刮削层（SOL）中沿磁力线存在相当大的电子压力降，以及到偏滤器板的等离子体通量减少与观察到的偏滤器区域中性压力和Dα发射增加的一致性。最后，提出了一种评估脱附程度和脱附窗口的方法，并根据这种偏滤器脱附的新定量定义总结了JET Mark I偏滤器实验的所有观察结果。
The experimental characteristics of divertor detachment in the JET tokamak with the Mark?I pumped divertor are presented for ohmic, L?mode and ELMy H?mode experiments with the main emphasis on discharges with deuterium fuelling only. The range over which divertor detachment is observed for the various regimes, as well as the influence of divertor configuration, direction of the toroidal field, divertor target material and active pumping on detachment, will be described. The observed detachment characteristics, such as the existence of a considerable electron pressure drop along the field lines in the scrape-off layer (SOL), and the compatibility of the decrease in plasma flux to the divertor plate with the observed increase of neutral pressure and D? emission from the divertor region, will be examined in the light of existing results from analytical and numerical models for plasma detachment. Finally, a method to evaluate the degree of detachment and the window of detachment is proposed, and all the observations of the JET Mark?I divertor experiments are summarized in the light of this new quantitative definition of divertor detachment.