Spontaneous Emission of Plasma Waves in the Presence of a Finite Amplitude Wave

概要

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The spontaneous Cerenkov emission of longitudinal waves in a plasma with small but finite amplitude wave (hereafter referred as the carrier wave) is investigated. Two effects of the carrier wave are taken into account; one is the modification of the test-particle orbit and the other that of the dielectric character of the plasma. It is shown that particles trapped in the potential-energy troughs of the carrier wave emit a discrete spectrum of sideband waves (in addition to the carrier wave itself) whose frequencies are different from the carrier-wave frequency by approximately integral multiples of the bounce frequency. An untrapped particle also emits waves at several different frequencies, including the one which satisfies the ordinary Cerenkov condition, but these frequencies depend on the particle velocity. The results are compared with those reported in our previous paper where only the effect of the orbit modification is taken into consideration.
社団法人日本物理学会の論文
1972-08-05