Interpretation of quasi-periodic frequency sweeping in electron cyclotron emission of nonequilibrium mirror-confined plasma sustained by high-power microwaves

In Viktorov et al (2016 Eur. Phys. Lett. 116 55001) we reported on chirping frequency patterns that have been observed in the electron cyclotron emission from strongly nonequilibrium plasma confined in a table-top mirror magnetic trap. These patterns were interpreted qualitatively as the first exper...

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Bibliographic Details
Published in:Plasma physics and controlled fusion 2019-08, Vol.61 (8), p.85020
Main Authors: Shalashov, A G, Gospodchikov, E D, Viktorov, M E
Format: Article
Language:English
Subjects:
broadband emission
electron cyclotron instabilities
open trap
wave-particle interaction
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Summary:In Viktorov et al (2016 Eur. Phys. Lett. 116 55001) we reported on chirping frequency patterns that have been observed in the electron cyclotron emission from strongly nonequilibrium plasma confined in a table-top mirror magnetic trap. These patterns were interpreted qualitatively as the first experimental evidence for so-called 'holes and clumps' mechanism acting at such high frequencies (1-10 GHz). In the present paper, we prove this statement on a more rigorous basis, considering the formation of nonlinear phase space structures in proximity of the wave-particle resonances within the framework of the Berk-Breizman theory adopted for a kinetically unstable mirror-confined plasma.
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/ab27a5