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(TH/P3-14) Kinetic Global Analysis of Alfvén Eigenmodes in Toroidal Plasmas

A. Fukuyama¹⁾, T. Akutsu^1)
 
1) Kyoto University, Kyoto, Japan

Abstract.  Systematic study on low to medium n (toroidal mode number) Alfvén eigenmodes (AE) in tokamaks and helical systems is presented. Linear stability of AE in the presence of energetic ions was studied using the kinetic full-wave code TASK/WM. We have reproduced the destabilizing effect of toroidal co-rotation on TAE for JT-60U parameters. We have found the existence of reversed-shear-induced Alfvén eigenmode (RSAE) which localizes near the q minimum in a reversed magnetic shear configuration. Two kinds of mode structures are identified for energetic particle mode (EPM) below the TAE frequency gap. The coupling to lower-frequency modes such as drift waves and MHD modes as well as the effect of trapped particles are also taken into account. For a helical plasma, the existence of GAE in the central region and TAE in the off-axis region was confirmed.

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