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Measurements of He I Line Profiles with Forbidden Components Induced by Fluctuating Fields in a Small Theta Pinch Plasma

1977; Physical Society of Japan; Volume: 43; Issue: 2 Linguagem: Inglês

10.1143/jpsj.43.648

1347-4073

Ken Kawasaki,

Plasma Diagnostics and Applications

Spectral line profiles of He I 4922 Å line (2 1 P-4 1 D, 1 F) and 4471 Å line (2 3 P-4 3 D, 3 F) with their forbidden components from a small linear theta pinch plasma have been measured and the plasma satellites have been observed on the wing of the line profiles. The observed profiles have broadened wings, and they are interpreted as the Doppler broadening due to fast neutral particles produced by the charge transfer with hot ions in the plasma of the neutral particle density of ∼10 14 cm -3 comparable with the plasma density. The low and high frequency fluctuating fields with the average strength of several kV/cm are deduced from the plasma satellites in the observed profiles.