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Experiments are described in which microwave power above or below the electron-cyclotron frequency is applied to mirror confined plasmas. Above resonance, a finite heating rate is measured. Below resonance, tne plasmas are expelled. The upper off-resonance heating rate and the lower-off-resonance power required to expel the plasma agree with the predictions of a proposed theoretical model in which the spatial variation of the microwave electric field of the multimode cavity randomizes the electron motion.
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Sprott et al. (1972) studied this question.
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