Nonlinear interaction of toroidicity‐induced drift modes
Nonlinear interaction of toroidicity‐induced drift modes
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DOI：
10.1063/1.864682
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发表时间：
1984-04
影响因子：
4.6
通讯作者：
P. Similon;P. Diamond
中科院分区：
文献类型：
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作者：
P. Similon;P. Diamond
环形结构中的漂移模被俘获电子的逆耗散破坏，并演化到非线性饱和态。利用重整化单点湍流理论求解气球表象中的非线性回旋动力学方程，证明了离子康普顿散射是一种有效的饱和机制。离子康普顿散射将波能量从短波长转移到长波长，在那里它被具有扩展的线性稳定的长波长模式的离子共振吸收。利用非线性饱和条件计算了涨落谱和涨落能级。传输系数和能量约束时间定标确定几个制度。具体而言，预测的约束时间密度缩放欧姆加热放电增加从n3/8在无碰撞制度的n9/8在耗散捕获的电子制度。
Drift modes in toroidal geometry are destabilized by trapped electron inverse dissipation and evolve to a nonlinearly saturated state. Using renormalized one‐point turbulence theory for the nonlinear gyrokinetic equation in the ballooning representation, it is shown that ion Compton scattering is an effective saturation mechanism. Ion Compton scattering transfers wave energy from short to long perpendicular wavelength, where it is absorbed by ion resonance with extended, linearly stable, long‐wavelength modes. The fluctuation spectrum and fluctuation levels are calculated using the condition of nonlinear saturation. Transport coefficients and energy confinement time scalings are determined for several regimes. Specifically, the predicted confinement time density scaling for an Ohmically heated discharge increases from n3/8 in the collisionless regime to n9/8 in the dissipative trapped electron regime.