Validation of electron temperature gradient turbulence in the Columbia Linear Machine
Validation of electron temperature gradient turbulence in the Columbia Linear Machine
复制标题
哥伦比亚线性机中电子温度梯度湍流的验证
DOI：
10.1063/1.3686148
复制
发表时间：
2012
影响因子：
2.2
通讯作者：
V. Sokolov
中科院分区：
文献类型：
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作者：
Xiangrong Fu;W. Horton;Y. Xiao;Zhihong Lin;A. Sen;V. Sokolov
电子温度梯度 (ETG) 模式是等离子体中湍流电子热传输的通用机制，是在哥伦比亚线性机的稳态、无碰撞氢等离子体中产生和验证的。具有强梯度的电子温度分布是由远程偏置网格中的直流加速和随后的热化产生的。测量了~5%的有限振幅、~0.3-0.5MHz（在等离子体框架中）的稳态振荡，其方位角波数为m~14-16，平行波数为k∥~0.01cm-1。大规模并行回旋环形代码用于研究这些模式。结果表明，在线性相中，色散关系符合动力学理论。在非线性阶段，非常强的非线性波耦合导致能量从增长最快的高m模到低m非线性振荡的逆级联，这与测量的方位模谱一致。波动的径向结构也同意......
The electron temperature gradient (ETG) mode, which is a universal mechanism for turbulent electron thermal transport in plasmas, is produced and verified in steady-state, collisionless hydrogen plasma of the Columbia Linear Machine. Electron temperature profiles with strong gradients are produced by DC acceleration in a remote biased mesh and subsequent thermalization. Finite amplitude ∼5%, steady-state oscillations at ∼0.3-0.5MHz (in the plasma frame), with azimuthal wave numbers m∼14-16 and parallel wave number k∥∼0.01cm-1 are measured. The massively parallel gyrokinetic toroidal code is used to study these modes. The results show that in the linear phase, the dispersion relation is consistent with kinetic theory. In the nonlinear stage, very strong nonlinear wave coupling gives rise to an inverse cascade of the energy from the fastest growing high-m modes to low-m nonlinear oscillations, which are consistent with the measured azimuthal mode spectrum. The radial structure of the fluctuation also agrees...