Abstract
Microinstability of the mirror confined plasma (mean ion energy is 5∼10 keV and maximum density is 7×10 7 cm -3 under an r f electric field, ω 0 =2.5ω c i is investigated experimentally and theoretically, where ω 0 is the frequency of the r f field and ω c i is the ion cyclotron frequency. The frequency of the observed oscillation, which is satisfactorily explained as a temporal growing loss cone instability, is above or nearly equal to 4ω c i . It seems, as predicted by the calculation, to shift slightly from 4ω c i by the effect of the r f field. This instability oscillation is damped with the r f field. The stabilization is owing to the energy spreading of ions and owing to the electron drifts induced by the r f field whose frequency is off-resonant from ion cyclotron frequency and its harmonics.
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