electrostatic normal modes observed in cylindrical traps-namely diocotron and Trivelpiece-
Gould waves. The Lawrence Non-neutral Torus II (LNT II) device is used to study such
waves. Electron plasma with densities in the range of 107 cm− 3 persisting for about 1
second are produced in LNT II with high vacuum conditions (< 10− 9 Torr), a toroidal
magnetic field magnitude up to 550 G. The plasma is diagnosed by monitoring image …