Session 7P - Plasma Applications and Plasma Technology.
POSTER session, Thursday morning, November 14
Exhibit Hall - Concourse Level, Adam's Mark
The efficiency of plasma production with various antenna geometries was studied in a long, 2-in diam helicon source in argon, with B of order 800G and 2 kW of 27.12 MHz RF power. Internal diagnostics include RF compensated Langmuir probes, RF magnetic probes, and an E-field probe; external devices measure antenna loading and direction of wave field rotation. Antennas with m = 0 symmetry and with m = +1 or -1 symmetry with and without end-rings, as well as half- and full- wavelength antennas. In particular, bifilar antennas producing fields rotating in the right- or left- hand directions were constructed and tested, to see if the m = -1 mode could be excited.