Resistive Alfvén spectrum of tokamaklike configurations in straight cylindrical geometry

Abstract

The resistive Alfvén spectrum for tokamaklike configurations with one or two singular surfaces is analyzed by combined WKBJ treatment and numerical solution using a spectral code. It is found that the ideal continua disappear; these are approximated only at the end points, at the singular surfaces, and at selected interior points (given by extrema of ωA(r)=‖k ⋅ B0‖/(ρ0)1/2). The normal modes are damped and the eigenvalues lie on specific curves that become independent of resistivity for small η.