Observation of quasi-periodic frequency sweeping in electron cyclotron emission of nonequilibrium mirror-confined plasma
M. E. Viktorov, A. G. Shalashov, D. A. Mansfeld, S. V. Golubev, (Institute of Applied Physics of Russian Academy of Sciences)
TL;DR
This paper reports the first experimental observation of chirping frequency patterns in electron cyclotron emission from nonequilibrium plasma, indicating the presence of nonlinear phase space structures related to wave-particle interactions.
Contribution
It provides the first experimental evidence of the 'holes and clumps' mechanism in electron cyclotron frequency domain within a mirror-confined plasma.
Findings
Observation of quasi-periodic frequency sweeping patterns.
Evidence supporting the 'holes and clumps' nonlinear phase space structures.
Confirmation of wave-particle resonance effects in electron cyclotron emission.
Abstract
Chirping frequency patterns have been observed in the electron cyclotron emission from strongly nonequilibrium plasma confined in a table-top mirror magnetic trap. Such patterns are typical for the formation of nonlinear phase space structures in a proximity of the wave-particle resonances of a kinetically unstable plasma, also known as the "holes and clumps" mechanism. Our data provides the first experimental evidence for acting of this mechanism in the electron cyclotron frequency domain.
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