ITER中的离散阿尔芬本征模

Discrete Alfvén eigenmodes in the ITER

本文主要研究了ITER稳态运行时的离散阿尔芬本征模的稳定特性。这些磁流体力学本征模是α引起的气球模驱动势阱中的束缚态。其中,α=-q2Rdβ/dr,q是安全因子,β是等离子压强和磁场压强的比值,R和r分别是环形等离子体的大半径和小半径。这些阿尔芬本征模很容易被高能量粒子激发而演变成不稳定模式而影响环形等离子体的约束性能。

Discrete Alfvén eigenmodes in the ITER are investigated in this paper. These magnetohydrodynamic eigenmodes are trapped by the α-induced potential wells along the magnetic field line. Here α=-q^2Rdβ/dr,q is the safety factor,β is the ratio between plasma and magnetic pressures, and R and r are, respectively, the major and minor radii. Due to negligible continuum damping via wave energy tunneling, these Alfvén eigenmodes can be readily destabilized by energetic particles.