Heat flux reduction by electromagnetic instabilities
Heat flux reduction by electromagnetic instabilities
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电磁不稳定性导致热通量减少
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
G. Laval
中科院分区：
文献类型：
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作者：
A. Ramani;G. Laval
研究了高温稠密等离子体中微不稳定性对热流密度的抑制作用。由于温度梯度引起的各向异性，类韦伯低频电磁模式变得不稳定。由此产生的混沌磁场有效地减小了电子的平均自由程。这些不稳定性的饱和预期来自模-模耦合。在估计的饱和水平下，自洽地发现平均自由程小于典型的梯度长度L，从而保持热通量低于自由流值，减少因子e′=（c/Lωp）1/3。
Heat flux inhibition by microinstabilities in hot and dense plasmas is investigated. Because of the anisotropy induced by the temperature gradient, Weibel‐like low frequency electromagnetic modes become unstable. The chaotic magnetic field thus generated effectively reduces the electron mean‐free‐path. Saturation of these instabilities is expected from mode‐mode couplings. With the estimated saturation level, the mean‐free‐path is self‐consistently found to be smaller than the typical gradient length L, thus keeping the heat flux below the free streaming value, with a reduction factor e′= (c/Lωp)1/3.