Direct comparison between circularly and linearly polarized RF fields in ICRF heating
Direct comparison between circularly and linearly polarized RF fields in ICRF heating
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ICRF 加热中圆偏振 RF 场和线偏振 RF 场的直接比较
DOI：
10.1088/0029-5515/20/11/006
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
R. Itatani
中科院分区：
文献类型：
--
作者：
Y. Yasaka;R. Itatani
采用m = +1圆极化射频场和m =±1线极化射频场产生的慢波对环形等离子体进行ICRF加热。通过对这两种场模式在波激发、离子加热和对等离子体约束的影响方面的直接比较，可以发现圆极化场在获得更高的加热效率和减少等离子体损耗方面远比线极化场有效。离子在线极化场中加热会伴随着增强的跨场等离子体损失，这在双流体理论中可以定量地解释为离子对流是由极性不对称射频场的质动势驱动的。
ICRF heating of a toroidal plasma is performed by using slow waves generated by m = +1 circularly polarized RF fields and m = ±1 linearly polarized RF fields. From a direct comparison of these two field modes with respect to wave excitation, ion heating, and effects on plasma confinement, it turns out that circularly polarized fields are far more effective than linearly polarized ones in both achieving higher heating efficiency and reducing plasma loss. Ion heating by linearly polarized fields is accompanied by enhanced cross-field plasma loss, which is, in terms of two-fluid theory, quantitatively explained by the fact that ion convection is driven by a ponderomotive force of poloidally asymmetric RF fields.