Non inductive formation of an extremely overdense spherical Tokamak by electron Bernstein wave heating and current drive on LATE
Non inductive formation of an extremely overdense spherical Tokamak by electron Bernstein wave heating and current drive on LATE
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后期通过电子伯恩斯坦波加热和电流驱动非感应形成极其稠密的球形托卡马克
DOI：
10.1051/epjconf/20158702006
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发表时间：
2015
影响因子：
--
通讯作者：
Hitoshi Tanaka and Takashi Maekawa
中科院分区：
文献类型：
--
作者：
Masaki Uchida;Yuto Noguchi;Hitoshi Tanaka and Takashi Maekawa
在低宽高比环面实验装置（LATE）中，利用电子伯恩斯坦（EB）波加热和电流驱动，实现了一种超密特殊托卡马克等离子体的非感应形成和维持。注入2.45 GHz的60 kW微波功率，等离子体电流达到12 kA，线平均电子密度超过等离子体截止密度的7倍。当混合共振层位于二次谐波ECR层的高场侧时，可以获得这种高度过密等离子体，这可以在EB波的第一传播带实现良好的耦合。研究了注入极化对极过密状态下模式到EB波的转换速率的影响，并观察到等离子体电流的改善。
An extremely overdense special Tokamak plasma has been non-inductively formed and maintained by electron Bernstein (EB) wave heating and current drive in the Low Aspect ratio Torus Experiment (LATE) device. The plasma current reaches 12 kA and the line-averaged electron density exceeds 7 times the plasma cut off density by injecting a 2.45 GHz microwave power of 60 kW. Such a highly overdense plasma is obtained when the upper hybrid resonance layer lies to the higher field side of the 2nd harmonic ECR layer, which may realize a good coupling to EB waves at their first propagation band. The effect of the injection polarization on the mode conversion rate to EB waves at the extremely overdense regime has been investigated and an improvement in the plasma current is observed.