Modes and quasi-modes for m=1,2 in a gyrokinetic model for a non-neutral plasma

Modes and quasi-modes for m = 1, 2 are studied in a gyro-kinetic model for a pure-electron plasma. Only z-independent perturbations are considered. Nu merical methods are used to solve the relevant differential equations for s mooth, analytic density profiles. Different temperatures and representative profiles are considered and comparison is made with the familiar cold flui d model from which the results depart but little, except at higher temperat ures. A continuum component to the spectrum, present in the cold-fluid mode l, remains in the gyro-kinetic model to the order considered. (C) 1999 Amer ican Institute of Physics. [S1070-664X(99)04005-7].