The dispersion equation for electrostatic oscillations in a current-bearing plasma is solved for marginal stability when the electron and ion temperatures are unequal. The result is applied to a plasma ohmically heated by a current which is constant with time. A criterion for instability is compared with a rather similar one for the formation of a runaway beam of electrons. Comparison is made with some experiments in which plasma has been ohmically heated (ZETA and Stellarator B1) and which has developed some instability.
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J. D. Jukes (1961) studied this question.
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