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Ring distribution of particles in a plasma in momentum space generates electromagnetic waves via cyclotron resonance. In addition to the well-known temperature anisotropy driven instability with finit...e wavenumber $k$, a wave mode around $k=0$ is excited due to relativistic mass variation of ring particles. We studied in detail long time evolution of this so-called cyclotron maser instability at $k=0$, by performing particle simulations using a plasma which consists of relativistic ring electrons, background positrons, and electrons, A phase transition like behaviour is observed as initial ring energy is varied.続きを見る
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