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Nonlinear interplay of AlfvEn instabilities and energetic particles in tokamaks

机译:Alfven Instabilities的非线性相互作用和托卡马克斯的精力粒子

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The confinement of energetic particles (EPs) is crucial in the efficient heating of tokamak plasmas. Plasma instabilities such as Alfven eigenmodes (AEs) can redistribute the EP population, making the plasma heating less effective and leading to additional loads on the walls. The nonlinear dynamics of toroidicity induced AEs (TAEs) is investigated by means of the global gyrokinetic particle-in-cell code ORB5, within the NEMORB project. The nonperturbative nonlinear interplay of TAEs and EPs due to the wave-particle nonlinearity is studied. In particular, we focus on the linear modification of the frequency, growth rate and radial structure of the TAE, caused by the nonlinear evolution of the EP distribution function. For the ITPA benchmark case, we find that the frequency increases when the growth rate decreases, and the mode shrinks radially. The theoretical interpretation is given in terms of a nonperturbative nonlinear evolution of the AE in relation to the Alfven continuum.
机译:精力充沛的颗粒(EPS)的限制对于Tokamak等离子体的有效加热至关重要。 诸如Alfven Eigenmodes(AES)之类的等离子体稳定性可以重新分配EP群体,使等离子体加热较低的效率较低,导致墙壁上的额外载荷。 通过在Nemorb项目中通过全球热能粒子内粒子代码ORB5研究环形性诱导的AES(TAE)的非线性动力学。 研究了由于波粒子非线性引起的TAE和EPS的非稳定性非线性相互作用。 特别是,我们专注于由EP分配功能的非线性演化引起的TAE的频率,生长速率和径向结构的线性修改。 对于ITPA基准案例,我们发现当增长速率降低时频率增加,并且模式径向缩小。 理论解释是根据AE关于Alfven连续体的非恐惧非线性演化给出的。

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