Session 7P - Plasma Applications and Plasma Technology.
POSTER session, Thursday morning, November 14
Exhibit Hall - Concourse Level, Adam's Mark
We have numerically investigated the field profiles of coupled helicon and Trivelpiece-Gould (TG) modes under conditions of low dc magnetic field when both branches of the dispersion relation are important. In particular, we can separate the contributions of the two branches to see if the mode coupling causes enhanced energy deposition near the radial boundary. The formulism can handle nonuniform density profiles, and it is interesting to see if the TG mode becomes less important if the density at the edge is small, thus weakening the mode coupling. Since our treatment of the nonuniform-plasma problem includes terms incorrectly omitted in the ANTENA \footnote B.D. McVey, MIT Plasma Fusion Reports PFC/RR-84-12 and 13 (1984). code, we also give examples of the magnitude of this error under different conditions.