Internal transport barrier formation induced by edge perturbation on LHD
Internal transport barrier formation induced by edge perturbation on LHD
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DOI：
10.1088/0029-5515/50/6/064012
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发表时间：
2010-06
期刊：
影响因子：
3.3
通讯作者：
S. Inagaki;N. Tamura;K. Ida;S. Kubo;T. Shimozuma;Y. Nagayama;K. Kawahata;S. Sudo;A. Fujisawa;K. Itoh;S. Itoh
中科院分区：
文献类型：
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作者：
S. Inagaki;N. Tamura;K. Ida;S. Kubo;T. Shimozuma;Y. Nagayama;K. Kawahata;S. Sudo;A. Fujisawa;K. Itoh;S. Itoh
电子内输运势垒(ITB)是在无净电流的LHD等离子体中由示踪剂包裹的固体粒子注入引起的边缘微扰形成的。边缘微扰触发的ITB发生在低密度区，且ITB不伴随着密度的显著变化。在中心温升开始时，中心区域的热流密度与距离等离子体半径一半处的温度梯度有很强的相关性。在温度梯度的增长阶段，突然出现了一种凹曲率的径向温度分布。通过流动和磁切变抑制湍流的机制不足以解释这些特征。
The electron internal transport barrier (ITB) is formed by an edge perturbation induced by a tracer encapsulated solid pellet injection in a net-current free LHD plasma. The ITB trigger by an edge perturbation takes place in the low density regime and the ITB is not accompanied by a significant change in the density. At the onset of the core temperature rise, there is a strong correlation between the heat flux in the central region and the temperature gradient at a distance half of the plasma radius away. A radial temperature profile with a concave curvature abruptly appears in the growing phase of temperature gradient. Turbulence suppression mechanisms via flow and magnetic shears are not sufficient to explain these features.