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arXiv 1603.06968physics.plasm-ph
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漂移动力学等离子体turbulence中相混合的抑制

Suppression of phase mixing in drift-kinetic plasma turbulence

J. T. Parker, E. G. Highcock, A. A. Schekochihin, P. J. Dellar

摘要:

在线性等离子体中,自由能通过相混合从大速度空间尺度转移到小速度空间尺度导致朗道阻尼。在湍流漂移动力学等离子体中,这种传输在统计上几乎被从小到大的速度空间尺度的逆传输所抵消,这是由于等离子体回波的随机形式所激发的“反相混合”模式。因此,流体矩(密度、速度、温度)近似与分布函数的较高矩在能量上隔离,因此当等离子体碰撞性小时,相混合作为耗散机制是无效的。

英文摘要:

Transfer of free energy from large to small velocity-space scales by phase mixing leads to Landau damping in a linear plasma. In a turbulent drift-kinetic plasma, this transfer is statistically nearly canceled by an inverse transfer from small to large velocity-space scales due to "anti-phase-mixing" modes excited by a stochastic form of plasma echo. Fluid moments (density, velocity, temperature) are thus approximately energetically isolated from the higher moments of the distribution function, so phase mixing is ineffective as a dissipation mechanism when the plasma collisionality is small.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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