Corr, C. S.; Boswell, R. W.
In this work, high-beta plasma effects are investigated in a low-pressure helicon plasma source
attached to a large volume diffusion chamber. When operating above an input power of 900 W and
a magnetic field of 30 G a narrow column of bright blue light due to Ar II radiation is observed
along the axis of the diffusion chamber. With this blue mode, the plasma density is axially very
uniform in the diffusion chamber; however, the radial profiles are not, suggesting that a large
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