The lifetime of energetic electrons generated via second harmonic electron-cyclotron-resonance heating in a symmetric magnetic mirror configuration is investigated experimentally. The decay time is observed to be as much as a factor of 4 shorter than the value calculated for the most rapid classical loss mechanism, Coulomb drag. The nonclassical loss component is shown to be induced by the microwave power available for electron heating. The microwave power required to sustain the temperature and density of the energetic electrons is calculated from the observed lifetimes and stored energy. It is found to be only a few percent of the total injected power which, in this experiment, is equal to or less than 1 kW.
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Boehmer et al. (1985) studied this question.
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