Lai, W. N., Chapman, Sandra C. and Dendy, R. O. (2015) Velocity space evolution of a minority energetic electron population undergoing the anomalous Doppler instability. Physics of Plasmas, 22 (11). 112119. doi:10.1063/1.4936101 ISSN 1070-664X.

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Abstract

The kinetic evolution in velocity space of a minority suprathermal electron population that is undergoing the anomalous Doppler instability (ADI) is investigated using the results from fully
nonlinear numerical simulations that self-consistently evolve particles and fields in a plasma.
Electron trajectories in phase space during different stages of the ADI are captured, and are analysed in relation to the characteristics of the excited electric fields and of the overall distribution of particles. For some electrons, trapping and mirroring effects are observed during the saturation
phase. A relationship between the second order moments of the perpendicular electron distribution function and time is established, and is used to investigate the range of applicability of analytical approximations drawn from classical theory, that involve a quasilinear wave-driven diffusion operator.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Official Date:	November 2015
Dates:	Date Event November 2015 Published 30 November 2015 Available 3 November 2015 Accepted 6 July 2015 Submitted
Volume:	22
Number:	11
Article Number:	112119
DOI:	10.1063/1.4936101
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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