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A photographic and oscillographic study of discharges in helium-carbon-dioxide mixtures at atmospheric pressure has shown that fine filaments develop in the discharge column. The origin of these nonuniform discharge paths is discussed, and a means for maximizing the energy input to the plasma prior to filamentation is presented. This process is of relevance to the design of TEA lasers.
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Johns et al. (1972) studied this question.
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