Plasma current start-up experiments using outboard- and top-launch lower hybrid wave on the TST-2 spherical tokamak
Plasma current start-up experiments using outboard- and top-launch lower hybrid wave on the TST-2 spherical tokamak
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DOI：
10.1088/1741-4326/57/3/036006
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发表时间：
2017-03
期刊：
影响因子：
3.3
通讯作者：
T. Shinya;Y. Takase;S. Yajima;C. Moeller;H. Yamazaki;N. Tsujii;Y. Yoshida;A. Ejiri;H. Togashi;K. Toida;H. Furui;H. Homma;K. Nakamura;B. Roidl;M. Sonehara;W. Takahashi;T. Takeuchi
中科院分区：
文献类型：
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作者：
T. Shinya;Y. Takase;S. Yajima;C. Moeller;H. Yamazaki;N. Tsujii;Y. Yoshida;A. Ejiri;H. Togashi;K. Toida;H. Furui;H. Homma;K. Nakamura;B. Roidl;M. Sonehara;W. Takahashi;T. Takeuchi
在TST-2型球形托卡马克上，利用低杂波（LHW）进行了无感等离子体电流启动实验。改变刮擦层内的等离子体条件后，以往外发射天线实验中观察到的密度极限消失，等离子体电流达到20 kA左右。为了通过等离子体首次通过时平行波数的上移来改善等离子体核心的LHW功率沉积，设计、制作并安装了一种新型顶发射天线。在初步实验中，仅使用顶发射天线就实现了等离子体电流上升至12 kA。利用测量的等离子体参数进行的射线追迹计算表明，在第一次通过时出现了较大的上移，满足了等离子体核心的强电子朗道阻尼条件。
Non-inductive plasma current start-up experiments were performed using the lower hybrid wave (LHW) on the TST-2 spherical tokamak. The density limit, observed in previous experiments using the outboard-launch antenna, disappeared after changing the plasma condition in the scrape-off layer, and the plasma current reached about 20 kA. In order to improve the LHW power deposition in the plasma core through an up-shift of the parallel wavenumber during the first pass through the plasma, a new top-launch antenna was designed, fabricated and installed. The plasma current ramp-up to 12 kA was achieved using the top-launch antenna alone in a preliminary experiment. Ray-tracing calculations using the measured plasma parameters showed a large up-shift during the first pass, satisfying the strong electron Landau damping condition in the plasma core.