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Bespalov et al (Published RiP Feb 2020).pdf (1.71 MB)

The beam pulse amplifier in space and laboratory plasmas

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journal contribution
posted on 2020-05-21, 08:19 authored by PA Bespalov, ON Savina, SWH Cowley
We discuss the physical background of the a new mechanism in which short electromagnetic pulses can be strongly amplified by interaction with suprathermal electrons in a near-equilibrium near-uniform magnetised plasma layer. This occurs under the special condition that the wave phase and group speeds along the field lines are equal, a condition met by extraordinary mode electromagnetic waves propagating in the medium. In this case the pulse interacts strongly via the Čerenkov resonance with suprathermal electrons moving along the field lines at the same speed as the pulse, leading to rapid wave growth, the instability within the pulse being shown to be equivalent to that of a monoenergetic electron beam moving along the field lines in an infinite uniform plasma. This effect accounts for basic features of powerful pulsed electromagnetic emissions in planetary magnetospheres, specifically whistler-mode chorus emissions in space plasmas, the remarkable radio emissions observed from brown dwarf objects, as well as in laboratory plasma.

Funding

This work was supported by RSF project No. 16-12-10528 (Sect. 2), by RFBR project No. 20-02-00206-a (Sect. 1,3), and by the Russian Academy of Sciences program No. 28 (numerical calculations).Work at the University of Leicester was supported by STFC Consolidated Grant ST/N000749/1.

History

Citation

Results in Physics, 2020, Volume 16, 103004

Author affiliation

Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Results in Physics

Volume

16

Pagination

103004

Publisher

Elsevier

eissn

2211-3797

Acceptance date

2020-02-09

Copyright date

2020

Language

en

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