Edge microtearing and drift instabilities in DIII-D tokamak plasmas
Edge microtearing and drift instabilities in DIII-D tokamak plasmas
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DOI：
10.1088/0029-5515/30/5/013
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发表时间：
1990-05
期刊：
影响因子：
3.3
通讯作者：
Y. Lau
中科院分区：
文献类型：
--
作者：
Y. Lau
结果表明，对于DIII-D边缘附近等离子体的H模剖面，微撕裂模比L模剖面更不稳定。这表明微撕裂不是L-H相变的原因。这主要是由于H模密度梯度较大，超过了磁剪切力的稳定作用。对于漂移不稳定性也得到了类似的结果，在边缘附近发现了两个模。微撕裂模的特征与实验观测到的准相干涨落非常相似，表明它们是密切相关的。
Microtearing modes are shown to be more unstable for H-mode profiles than for L-mode profiles of plasma near the edge of DIII-D. This indicates that microtearing is not responsible for the L-H transition. This result is mainly attributed to the large H-mode density gradient which outweighs the stabilizing effect of magnetic shear. A similar result is obtained for drift instabilities, for which two modes are found near the edge. The characteristics of the microtearing modes and the experimentally observed quasicoherent fluctuations are very similar, suggesting that they are closely related.