Particle-in-cell simulations of parametric decay instability of radiofrequency wave in the ion cyclotron range of frequency in an inhomogeneous plasma
Particle-in-cell simulations of parametric decay instability of radiofrequency wave in the ion cyclotron range of frequency in an inhomogeneous plasma
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DOI：
10.1088/0029-5515/55/6/063002
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发表时间：
2015-06
期刊：
影响因子：
3.3
通讯作者：
C. Gan;N. Xiang;J. Ou;Zhizhen Yu
中科院分区：
文献类型：
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作者：
C. Gan;N. Xiang;J. Ou;Zhizhen Yu
采用粒子模拟方法研究了非均匀等离子体中离子回旋频率范围内射频波的参量衰减过程。通过选择接近HT-7托卡马克离子伯恩斯坦波加热实验的参数（Li et al . 2001）。控制。聚变43(1227-38)，在模拟中发现了与实验观察相似的衰变通道。结果表明，由于托卡马克边缘等离子体的强非均匀性，可能存在满足模模耦合选择规则的层，如果输入波功率足够高，则会发生共振参数衰减。结果，在泵浦波的半、二、三次谐波频率的子波可以被激发。非共振参量衰减也被观察到，离子通过非线性朗道阻尼加热。
Particle-in-cell simulations have been conducted to investigate the parametric decay processes of radiofrequency waves in the ion cyclotron range of frequency in inhomogeneous plasmas. By choosing the parameters close to those in the ion Bernstein wave heating experiments on the HT-7 tokamak (Li et al 2001 Plasma Phys. Control. Fusion 43 1227–38), decay channels similar to experimental observations have been found in simulations. It is shown that due to strong inhomogeneity of tokamak edge plasma, layers may exist where selection rules of the mode–mode coupling are satisfied, and resonant parametric decays can occur if the input wave power is sufficiently high. As a result, daughter waves at half-, second- and third-harmonic frequencies of the pump wave can be excited. The nonresonant parametric decay is also observed, and ions are heated via nonlinear Landau damping.