Nonlinear excitation of finite-radial-scale zonal structures by toroidal Alfven eigenmode
Nonlinear excitation of finite-radial-scale zonal structures by toroidal Alfven eigenmode
复制标题
环形阿尔文本征模对有限径向尺度带状结构的非线性激励
DOI：
10.1088/1741-4326/aa6413
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发表时间：
2017
期刊：
影响因子：
3.3
通讯作者：
Zonca Fulvio
中科院分区：
文献类型：
--
作者：
Qiu Zhiyong;Chen Liu;Zonca Fulvio
导出了一组描述单个环形Alfvén本征模非线性演化的方程组，包括零频率带状结构（ZFZS）的产生和波粒相空间非线性。忽略波粒相空间非线性的简化情况下，然后研究集中在不同的角色高能粒子和散装等离子体ZFZS生成。结果表明，在不同的非线性阶段，高能粒子和体等离子体在零频区的产生中起主导作用，相应的过程是不同的。ZFZS产生的几个属性，如细与中尺度，强迫驱动与自发激发，澄清本分析。
The set of equations describing nonlinear evolution of a single toroidal Alfvén 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 ZFZS generation, eg fine-versus meso-scale, forced driven versus spontaneous excitation, are clarified by the present analysis.