Session 7P - Plasma Applications and Plasma Technology.
POSTER session, Thursday morning, November 14
Exhibit Hall - Concourse Level, Adam's Mark
Plasma production by a short helicon source injecting into a field-free region or a magnetic bucket has been investigated. As the dc magnetic field is varied from 0 to 50G, the density outside the source decreases, so that the maximum density is actually found at 0G, where no helicon waves can exist. One reason for the inverse B dependence is simply the spreading of the plasma in the nonuniform field. We have tried to find the minimum length of uniform B region required for coupled helicon-TG modes \footnote D. Arnush and F.F. Chen, this meeting. to be excited. Measurements were made in argon with 500-2000 W of RF power at both 13.56 and 27.12 MHz, using various antenna designs.