Nonlinear current-driven ion-acoustic instability driven by phase-space structures
Nonlinear current-driven ion-acoustic instability driven by phase-space structures
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DOI：
10.1088/0741-3335/56/7/075005
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发表时间：
2014-07-01
影响因子：
2.2
通讯作者：
Kosuga, Y.
中科院分区：
文献类型：
--
作者：
Lesur, M.;Diamond, P. H.;Kosuga, Y.
分析了无碰撞电子-离子等离子体中电流驱动离子声波的非线性稳定性。从20世纪80年代的种子模拟被重新审视。精确的数值处理表明，亚临界不稳定性不增长，从合奏波，除了非常接近边缘稳定性和大的初始振幅。进一步从边际稳定性，一个孤立的相空间结构可以驱动亚临界不稳定性搅拌相空间在其尾流。相空间湍流，其中包括许多结构，是更有效的驱动亚临界粒子再分布，湍流加热和异常电阻率比一个合奏的波或一个孤立的孔。在亚临界模拟中观察到相空间射流。
The nonlinear stability of current-driven ion-acoustic waves in collisionless electron-ion plasmas is analyzed. Seminal simulations from the 1980s are revisited. Accurate numerical treatment shows that subcritical instabilities do not grow from an ensemble of waves, except very close to marginal stability and for large initial amplitudes. Further from marginal stability, one isolated phase-space structure can drive subcritical instabilities by stirring the phase-space in its wake. Phase-space turbulence, which includes many structures, is much more efficient than an ensemble of waves or an isolated hole for driving subcritically particle redistribution, turbulent heating and anomalous resistivity. Phase-space jets are observed in subcritical simulations.