Physics of Fluids B: Plasma Physics
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Sheehan, D.P., McWilliams and N. Rynn, Adjustable levels of strong turbulence in a positive/negative ion plasma, Physics of Fluids B 5, 1523 (1993).
Positive/negative ion plasmas, composed of Ba+, SF6−, and residual electrons, were observed to display characteristics of strong turbulence.Experiments on the UCI Q machine linked the presence of negative ions (and the depletion of electrons) with large density fluctuations (δn/n≂1), large‐amplitude, low‐frequency electrostatic noise (f≤20 kHz), and rapid transport of ions across magnetic field lines (D⊥≂104 cm2/sec). Ion velocity distributions were heated parallel to and cooled perpendicular to the confining magnetic field. The partial pressure of gaseous SF6 was shown to serve as a regulator of plasma turbulence. Turbulence levels could be smoothly varied from quiescent states (δn/n≂0.01) to strongly turbulent states (δn/n≂1).
Digital USD Citation
Sheehan, D. P.; McWilliams, R.; and Rynn, N., "Adjustable levels of strong turbulence in a positive/negative ion plasma" (1993). Physics and Biophysics: Faculty Publications. 1.