由高能粒子介导的强迫驱动环向流对离子温度梯度模式的缓解作用

漂移波孤子通过强迫驱动带状流的形成及其对等离子体约束的启示

Drift wave soliton formation via forced-driven zonal flow and implication on plasma confinement

本文提出漂移波通过强迫驱动带状流自调节的回旋动理学理论，发现抗磁漂移频率非均匀性主导带状流产生，数值求解非线性薛定谔方程表明漂移波包络孤子可形成并导致湍流扩展，但受波包转向点限制。

Effects of energetic particles on zonal flow generation by toroidal Alfven eigenmode

Generation of zonal ow (ZF) by energetic particle (EP) driven toroidal Alfven eigenmode (TAE) is investigated using nonlinear gyrokinetic theory. It is found that, nonlinear resonant EP contri- bution dominates over the usual Reynolds and Maxwell stresses due to thermal plasma nonlinear response. ZF can be forced driven in the linear growth stage of TAE, with the growth rate being twice the TAE growth rate. The ZF generation mechanism is shown to be related to polarization induced by resonant EP nonlinearity. The generated ZF has both the usual meso-scale and micro- scale radial structures. Po…

Nonlinear excitation of fine-radial-scale zonal structures by toroidal Alfven eigenmode

The set of equations describing nonlinear evolution of a single toroidal Alfven eigenmode are derived, including both zero frequency zonal structure (ZFZS) generation and wave-particle phase space nonlinearities. The simplified case of neglecting wave-particle phase space nonlinearity is then investigated to focus on different roles of energetic particles and bulk plasmas on ZFZS generation. It is shown that energetic particles and bulk plasma play dominant roles in ZFZS generation in different nonlinear stages, and the corresponding processes are qualitatively different. Several properties of…

回转动理学湍流中带状流驱动的弱非线性理论

A Weakly Nonlinear Theory of Zonal-Flow Forcing in Gyrokinetic Turbulence

基于弱非线性三波截断模型，研究微不稳定性驱动湍流对带状流的强迫生成，预测早期非线性阶段带状流k_ψ谱，并揭示驱动涨落对带状流相空间结构的约束导致残余谱增强。

Effects of anisotropic energetic particles on zonal flow residual level

In tokamak plasmas, the interaction among the micro-turbulence, zonal flows (ZFs) and energetic particles (EPs) can affect the turbulence saturation level and the consequent confinement quality and thus, is important for future burning plasmas. In this work, the EP anisotropy effects on the ZF residual level are studied by using anisotropic EP distributions with dependence on pitch. Significant effects on the long wavelength ZFs have been found when small to moderate width around the dominant pitch in the EP distribution function is assumed. In addition, it is found that ZF residual level is e…

Zonal Flow as Pattern Formation

Zonal flows are well known to arise spontaneously out of turbulence. We show that for statistically averaged equations of the stochastically forced generalized Hasegawa-Mima model, steady-state zonal flows and inhomogeneous turbulence fit into the framework of pattern formation. There are many implications. First, the wavelength of the zonal flows is not unique. Indeed, in an idealized, infinite system, any wavelength within a certain continuous band corresponds to a solution. Second, of these wavelengths, only those within a smaller subband are linearly stable. Unstable wavelengths must evolv…