Coupled ion temperature gradient and trapped electron mode to electron temperature gradient mode gyrokinetic simulations
Coupled ion temperature gradient and trapped electron mode to electron temperature gradient mode gyrokinetic simulations
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DOI：
10.1063/1.2436851
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发表时间：
2007-05
影响因子：
2.2
通讯作者：
R. Waltz;J. Candy;M. Fahey
中科院分区：
文献类型：
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作者：
R. Waltz;J. Candy;M. Fahey
电子温度梯度(ETG)输运通常被定义为电子在高波数(High-k)处的能量输运，其中离子是绝热的，不存在离子能量或等离子体输运。以前的回转动力学模拟假定绝热离子(ETG-ai)，并在小电子回旋辐射尺度上工作。然而，这种捕获电子的ETG-AI模拟通常不具有良好的非线性饱和，除非考虑完全动力学离子(KI)和适当的离子尺度带状流动模式。电子能量输运在高k时分离为ETG-KI，在低k时分离为离子温度梯度陷阱电子模(ITG/TEM)。提出了ITG/TEM和ETG-KI湍流耦合的高分辨率、大尺度离子通量管模拟方法。这需要一个高的有效雷诺数R≡[k(最大)/k(最小)]2=μ2，其中μ=[ρsi/ρsi]是离子与电子回旋射线的比率。计算时间比μ3快。通过将耦合的昂贵模拟与(1)进行比较...
Electron temperature gradient (ETG) transport is conventionally defined as the electron energy transport at high wave number (high-k) where ions are adiabatic and there can be no ion energy or plasma transport. Previous gyrokinetic simulations have assumed adiabatic ions (ETG-ai) and work on the small electron gyroradius scale. However such ETG-ai simulations with trapped electrons often do not have well behaved nonlinear saturation unless fully kinetic ions (ki) and proper ion scale zonal flow modes are included. Electron energy transport is separated into ETG-ki at high-k and ion temperature gradient-trapped electron mode (ITG/TEM) at low-k. Expensive (more computer-intensive), high-resolution, large-ion-scale flux-tube simulations coupling ITG/TEM and ETG-ki turbulence are presented. These require a high effective Reynolds number R≡[k(max)∕k(min)]2=μ2, where μ=[ρsi∕ρsi] is the ratio of ion to electron gyroradii. Compute times scale faster than μ3. By comparing the coupled expensive simulations with (1)...