Non-inductive plasma start-up experiments on the TST-2 spherical tokamak using waves in the lower-hybrid frequency range
Non-inductive plasma start-up experiments on the TST-2 spherical tokamak using waves in the lower-hybrid frequency range
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使用较低混合频率范围内的波对 TST-2 球形托卡马克进行非感应等离子体启动实验
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发表时间：
2015
期刊：
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通讯作者：
T. Yamaguchi
中科院分区：
文献类型：
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作者：
T. Shinya;Y. Takase;T. Wakatsuki;A. Ejiri;H. Furui;J. Hiratsuka;K. Imamura;T. Inada;H. Kakuda;H. Kasahara;R. Kumazawa;C. Moeller;T. Mutoh;Y. Nagashima;K. Nakamura;A. Nakanishi;T. Oosako;K. Saito;T. Seki;M. Sonehara;H. Togashi;S. Tsuda;N. Tsujii;T. Yamaguchi
在TST-2球形托卡马克装置(R0⩽0.38m，a⩽0.25m，Bt0⩽0.3T，Ip⩽0.14 MA)上，采用11单元电感耦合组合天线、介质加载4波导阵天线和13单元电容耦合组合天线，研究了低混频范围(200 MHz)的无感等离子体电流启动和波保持问题。最大等离子体电流分别为15kA、10kA和16kA。电流驱动优值系数最高的是CCC天线。电流驱动的效率应该通过在更高的等离子体电流(以改善轨道限制)和更高的环形磁场(以改善对等离子体核心的波的可及性)下操作来减少高能电子的瞬时轨道损失来提高，同时保持足够高的密度(以避免电子的过度加速)，但在“密度限制”之下。
Non-inductive plasma current start-up and sustainment by waves in the lower-hybrid frequency range (200 MHz) have been studied on the TST-2 spherical tokamak (R0 ⩽ 0.38 m, a ⩽ 0.25 m, Bt0 ⩽ 0.3 T, Ip ⩽ 0.14 MA) using three types of antenna: the 11-element inductively-coupled combline antenna, the dielectric loaded 4-waveguide array antenna, and the 13-element capacitively-coupled combline (CCC) antenna. The maximum plasma currents of 15 kA, 10 kA and 16 kA were achieved, respectively. The highest current drive figure of merit was achieved by the CCC antenna. The efficiency of current drive should improve by reducing prompt orbit losses of high energy electrons by operating at higher plasma current (to improve orbit confinement) and higher toroidal magnetic field (to improve wave accessibility to the plasma core), while keeping the density high enough (to avoid excessive acceleration of electrons), but under the ‘density limit’.