EFFECT OF TIME-VARYING ELEVATED GAS TEMPERATURES ON PLASMA TRANSPORT LOSSES IN HELIUM AFTERGLOWS.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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The temperature dependence of ambipolar diffusion in helium afterglow plasmas is investigated at gas temperatures between 1200K and 2500K. The heating of the gas and the excitation of acoustic waves by pulsed discharges are utilized to generate and measure the elevated temperatures. The electron density decay is measured with microwaves. The effects of the inhomogeneous temperature distribution and of convection due to the cooling of the gas are discussed, and recombination losses are taken into account. The experimental plasma decay rates support the theoretical temperature dependence of the diffusion coefficient. Author
- Plasma Physics and Magnetohydrodynamics