Plasma Current Effects on Unstable Resistive Drift-Alfvén Modes in a Magnetized Cylindrical Plasma

概要

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In a currentless plasma, there are many unstable drift-Alfvén modes with different radial eigenfunctions with fixed poloidal and toroidal mode numbers, m and n, respectively. When growth rates of unstable modes are plotted as a function of total plasma current Ip, two opposite tendencies, stabilization and destabilization, are seen with the increase of Ip. When two eigenvalues (ωrj,ωij) and (ωrj+1,ωij+1), where j denotes the order of the eigenvalue from the largest one, for given m and n become close at $I_{p}\simeq I_{c}$ in a large current regime, the real frequencies do not cross. However, sometimes the two growth rates cross or ωij=ωij+1 occurs, although the real frequencies satisfy ωrj>ωrj+1. The eigenfunctions of the resistive drift-Alfvén mode with (ωrj,ωij) at Ip≤Ic are similar to those with (ωrj+1,ωij+1) at Ip≥Ic, where ωrj>ωrj+1. These unstable modes may affect the magnetic spectrum of the drift-Alfvén frequency range.
Physical Society of Japanの論文
2001-11-15