Experimental study of impurity screening in the edge ergodic layer of the Large Helical Device using carbon emissions of CIII to CVI
Experimental study of impurity screening in the edge ergodic layer of the Large Helical Device using carbon emissions of CIII to CVI
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DOI：
10.1063/1.3103784
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发表时间：
2009-06
影响因子：
2.2
通讯作者：
M. Chowdhuri;S. Morita;M. Kobayashi;M. Goto;Hangyu Zhou;S. Masuzaki;T. Morisaki;K. Narihara;I. Yamada;Yuehe Feng
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文献类型：
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作者：
M. Chowdhuri;S. Morita;M. Kobayashi;M. Goto;Hangyu Zhou;S. Masuzaki;T. Morisaki;K. Narihara;I. Yamada;Yuehe Feng
在真空紫外和极紫外区观察到CIII（977.03 A：2s 2S 10 - 2s 2 pP 11），CIV（1550 A：2sS 2 - 2 pP 2），CV（40.27 A：1 s2 S10- 1 s2 pP 11）和CVI（33.73 A：1 sS 2 - 2 pP 2）四个共振跃迁，研究了大螺旋器件各态历经层中边缘碳杂质的输运.这里，CIII和CIV表示在各态历经层的外边界处的碳流入，CV和CVI表示在较高电离阶段中的离子，其已经经历了在各态历经层中的传输。因此，CV+CVI与CIII+CIV的强度比代表了杂质屏蔽的程度，并在不同的边缘等离子体参数和各态历经磁场结构下进行了分析。在1-8×1019 m−3的范围内，随着电子密度ne的增加，这个比值降低了两个数量级。CV和CVI的排放量趋于减少与ne，而CIII和CIV的排放量单调增加与ne。实验结果表明，杂质的引入提高了晶体的稳定性。
Four resonance transitions of CIII (977.03 A:2s2 S10-2s2p P11), CIV (1550 A:2s S2-2p P2), CV (40.27 A:1s2 S10-1s2p P11), and CVI (33.73 A:1s S2-2p P2) have been observed in vacuum ultraviolet and extreme ultraviolet regions to study the edge carbon impurity transport in the Large Helical Device ergodic layer. Here, CIII and CIV indicate the carbon influx at the outside boundary of the ergodic layer and CV and CVI indicate the ions in higher ionization stages, which have already experienced the transport in the ergodic layer. The intensity ratio of CV+CVI to CIII+CIV, therefore, represents the degree of impurity screening, which has been analyzed with different edge plasma parameters and ergodic magnetic field structures. The ratio decreases by two orders of magnitude with an increase in electron density ne in the range of 1–8×1019 m−3. The CV and CVI emissions tend to decrease with ne, whereas the CIII and CIV emissions monotonically increase with ne. The result suggests an enhancement of the impurity scr...