Characterization of Type-I ELMs in tangential co-, balanced- and counter- plus perpendicular NBI heated plasmas on JT-60U
Characterization of Type-I ELMs in tangential co-, balanced- and counter- plus perpendicular NBI heated plasmas on JT-60U
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DOI：
10.1088/0741-3335/48/5a/s12
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发表时间：
2006-04
影响因子：
2.2
通讯作者：
K. Kamiya;H. Urano;Y. Koide;T. Takizuka;N. Oyama;Y. Kamada
中科院分区：
文献类型：
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作者：
K. Kamiya;H. Urano;Y. Koide;T. Takizuka;N. Oyama;Y. Kamada
在JT-60U托卡马克上，系统地研究了等离子体旋转和快离子损失对i型ELM特性的影响，扫描了三种等离子体配置（等离子体边缘对应的环向场纹波，δr ~ 0.4, 1.0和2.0%）下的NBI（切向共、平衡和反NBI加上垂直NBI）组合。在i型ELM特性上的新发现如下：与共nbi放电相比，反nbi的ELM能量损失（由基座储能归一化）更小，ELM频率（fELM）更快。然而，由于ELM， PELM （= ΔWELM × fELM）的功率损失，通过加热功率穿过分离矩阵psp归一化，无论在每个等离子体配置下动量注入的方向如何，都是恒定的。PELM/PSEP随δr的增大而减小。讨论了elm、旋转和快离子损失之间的关系。
Effects of plasma rotation and losses of fast ions on Type-I ELM characteristics have been systematically studied in the JT-60U tokamak, scanning combinations of NBI (tangential co-, balanced- and counter-NBI plus perpendicular NBI) in the three types of plasma configurations (corresponding toroidal field ripple at the plasma edge, δr ∼ 0.4, 1.0 and 2.0%). New findings on the Type-I ELM characteristics are as follows: smaller ELM energy loss normalized by pedestal stored energy, ΔWELM/Wped, and faster ELM frequency, fELM, are confirmed in the counter-NBI in comparison with the co-NBI discharges. Nevertheless, the power loss due to ELM, PELM (= ΔWELM × fELM), normalized by heating power crossing the separatrix, PSEP, is constant regardless of the direction of the momentum injection at each plasma configuration. In contrast, the PELM/PSEP decreases with increasing δr. The relationship between ELMs, rotation and the losses of fast ions are discussed.