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Abstract
An oscillating magnetic field produces a hollow cylindrical helium plasma in the presence of a slowly varying bias field. The field penetrates to the center in the first quarter cycle, but is then shielded by a current layer without significant compression. The plasma is observed end-on in the helium I lines λ 4471.48 Å (23P←43D) and λ 4921.93 Å (21P←41D) and their nearby forbidden components at λ 4470.04 Å and λ 4920.59 Å, respectively. During the early phases of the discharge the forbidden components have intensities in the central, low density region much higher than those expected in a thermal plasma, indicating the presence of microinstabilities which cause suprathermal electric field fluctuations. The nonthermal or turbulent state of this low temperature (∼1 eV) plasma is consistent with the presence of an appreciable number of high energy (∼600 eV) electrons, indicated primarily by the spectroscopic investigations and verified by x-ray measurements.
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