Abstract
A self consistent Langevin model of particle heating in plasma sheaths is developed to predict particle kinetic temperature. Particles are heated by plasma sheath fluctuations and cooled by neutral gas friction. The balance of heating and cooling leads to particle kinetic temperatures that increase with decreasing pressure or increasing plasma power and show threshold behavior. The abnormally high kinetic temperatures observed in some experiments result from the competition between fluctuation heating and frictional cooling just above the system bifurcation point where the particle is still suspended and nearly free.
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