论文标题
弱磁化等离子体中的潜在涡度传输
Potential Vorticity Transport in Weakly and Strongly Magnetized Plasmas
论文作者
论文摘要
纠结的磁场，通常与有序的平均场共存，对许多等离子体的湍流和动量传输有重大影响，包括在太阳速率和磁性限制装置中发现的等离子体。我们提出了一种新颖的平均涡度理论，即在$β$ - 平面磁流失动力学（MHD）和漂移波湍流中。我们的结果表明，均方体随机场强烈降低了雷诺的压力连贯性。由于随机场散射引起的潜在涡度通量的这种破坏性导致动量转运和纬向流动形成的抑制。一个简单的计算表明，随机场破坏剪切涡流反馈回路是物理机制的关键。识别量化功率阈值增量的无量纲参数被识别，并用于评估随机场对L-H转变的影响。我们讨论了作为抵抗弹性网络的随机场模型。
Tangled magnetic fields, often coexisting with an ordered mean field, have a major impact on turbulence and momentum transport in many plasmas, including those found in the solar tachocline and magnetic confinement devices. We present a novel mean field theory of potential vorticity mixing in $β$-plane magnetohydrodynamic (MHD) and drift wave turbulence. Our results show that mean-square stochastic fields strongly reduce Reynolds stress coherence. This decoherence of potential vorticity flux due to stochastic field scattering leads to suppression of momentum transport and zonal flow formation. A simple calculation suggests that the breaking of the shear-eddy tilting feedback loop by stochastic fields is the key underlying physics mechanism. A dimensionless parameter that quantifies the increment in power threshold is identified and used to assess the impact of stochastic field on the L-H transition. We discuss a model of stochastic fields as a resisto-elastic network.
