Session GP1 - Poster Session IV.
POSTER session, Tuesday afternoon, October 30
Exhibit Hall B,
An electron plasma with n\approx 3\times 10^6 cm^-3 is confined in a partially toroidal trap with a magnetic field of 196 G. Trapping times on the order of 100 \mu s are achieved. We actively control the horizontal electric field generated by auxiliary electrodes. The horizontal electric field functions for toroidal electron plasma equilibria as the analog of a vertical magnetic field for toroidal MHD equilibria. During trapping, oscillations are observed with frequencies on the order of 100 kHz. These oscillations have frequencies that are proportional to 1/B and also depend on the horizontal electric field strength. We will report on our investigation into the nature of these oscillations using a new set of four wall probes in addition to a five-tip insertable floating potential probe. The wall probes are spaced both toroidally and poloidally around the chamber to allow us to observe the large-scale spatial structure of the oscillations.