Abstract
Negative absorption for extraordinary waves by the weakly relativistic electrons with the energy less than 20 keV gyrating in a tenuous plasma confined in a mirror field is studied by the microwave transmission method. Typical amplification factor of approximately 30 dB for the input power of a few milliwatts is observed during both heating period and after-glow. The experimental results are best explained by the relativistic mass effect obtained by Bekefi et al. for the energetic electron plasmas. Further the formation and relaxation of the distribution function of the energetic electrons are studied through the analysis of the temporal variation of the negative absorption. New method of microwave diagnostics for the determination of energy distribution function of energetic electrons in the tenuous magnetized plasma is proposed.
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