Frequency Sweeping in Plasmas due to Phase‐Space Structures
Frequency Sweeping in Plasmas due to Phase‐Space Structures
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DOI：
10.1080/00411450500274410
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发表时间：
2005-08
影响因子：
--
通讯作者：
H. Berk
中科院分区：
文献类型：
--
作者：
H. Berk
摘要本文考察了等离子体在边缘稳定附近的非线性动力学，其中背景等离子体中的失稳共振动能驱动和稳定耗散之间存在平衡。根据共振粒子的非本征随机性程度，解析地描述了不同的饱和态。在足够低的随机性下，预测了一个爆炸性的自相似解。数值模拟表明，这种爆炸行为是形成空穴和块状相空间结构的先兆，这种空穴和块状结构由于等离子体耗散而导致频率扫频上移。对预测行为的实验证据进行了讨论。
Abstract This review examines the nonlinear dynamics of a plasma near marginal stability where there is a balance between the destabilizing resonant kinetic drive and the stabilizing dissipation in the background plasma. Depending on the degree of extrinsic stochasticity of the resonant particles, different saturated states are analytically described. At low enough stochasticity, an explosive self‐similar solution is predicted. Numerical simulation shows this explosive behavior is a precursor to the formation of phase space structures in the form of holes and clumps, which cause up an down shifted frequency sweeping due to plasma dissipation. Experimental evidence for the predicted behavior is discussed.