Abstract

Complex dynamics has been observed in the spectra of electron cyclotron emission of nonequilibrium plasma confined in a tabletop mirror trap. Microwave emission is a set of highly chirped radiation bursts with both increasing and decreasing frequencies which are repeated periodically. Such chirped bursts are not described well in the framework of a standard quasilinear approach. On the other hand, the simultaneous observation of several chirped bursts in the same frequency range is typical of the formation of nonlinear phase-space structures in the vicinity of the wave-particle resonances in the kinetically unstable plasma, also known as the “holes and clumps” mechanism.

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