Coupling of fast waves launched into the JFT-2M tokamak by a phased four-loop antenna array
Coupling of fast waves launched into the JFT-2M tokamak by a phased four-loop antenna array
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相控四环天线阵列发射到 JFT-2M 托卡马克的快波耦合
DOI：
10.1088/0029-5515/30/2/008
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发表时间：
1990
期刊：
影响因子：
3.3
通讯作者：
T. Fujita
中科院分区：
文献类型：
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作者：
Y. Uesugi;Takumi Yamamoto;H. Kawashima;K. Hoshino;H. Aikawa;Satoshi Kasai;T. Kawakami;Takashi Kondoh;H. Maeda;Tatsuma D. Matsuda;H. Matsumoto;Y. Miura;M. Mori;C. R. Neufeld;K. Odajima;H. Ogawa;T. Ogawa;K. Ohasa;H. Ohtsuka;S. Sengoku;T. Shoji;N. Suzuki;H. Tamai;T. Yamauchi;I. Nakazawa;T. Fujita
描述了相控四环天线阵激励的快波的耦合特性。在较低混合频率范围内的快波有可能在高温和致密的等离子体中产生等离子体电流。在平行于环形方向的振荡磁场作用下，在等离子体边缘激发出快波。激励快波的平行波数由每个天线上的射频电流的相对相位决定。天线的负载电阻随密度增大而增大，但当密度大于2×1019m−3时，由于密度梯度变陡，天线的负载电阻开始随密度减小。加载电阻强烈地依赖于天线的相位。面波激励载荷在Δϕ=0时最大，在Δϕ=π时最小。当天线的相位为Δϕ=π时，在等离子体中心观察到激发的快波被大量吸收。吸收效率随激发波相速度的降低而增大。耦合实验得到的实验结果与理论预测是一致的。
The coupling characteristics of the fast wave excited by a phased four-loop antenna array are described. Fast waves in the lower hybrid frequency range have the potential of generating plasma current in hot and dense plasmas. Fast waves are excited at the plasma edge by an oscillating magnetic field parallel to the toroidal direction. The parallel wavenumber of the excited fast waves is determined by the relative phase of the RF current on each antenna. The loading resistance of the antenna increases with density, but at densities above 2 × 1019 m−3 it starts to decrease with density, because of the steepening of the density gradient. The loading resistance is strongly dependent on the antenna phasing. The maximum loading due to surface wave excitation is obtained at Δϕ = 0 and the minimum at Δϕ = π. Substantial absorption of the excited fast waves is observed at the plasma centre when the antenna phasing is Δϕ = π. The absorption efficiency rises with decreasing phase velocity of the excited waves. The experimental results obtained in the coupling experiment are consistent with theoretical predictions.
安.职业.Hyg.28-2。
DOI：
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发表时间：
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期刊：
影响因子：
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作者：
通讯作者：
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