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.
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November 2015
Research Article|
November 30 2015
Velocity space evolution of a minority energetic electron population undergoing the anomalous Doppler instability
W. N. Lai;
W. N. Lai
1Centre for Fusion, Space and Astrophysics, Department of Physics,
University of Warwick
, Coventry, United Kingdom
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S. C. Chapman
;
S. C. Chapman
a)
1Centre for Fusion, Space and Astrophysics, Department of Physics,
University of Warwick
, Coventry, United Kingdom
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R. O. Dendy
R. O. Dendy
1Centre for Fusion, Space and Astrophysics, Department of Physics,
University of Warwick
, Coventry, United Kingdom
2CCFE,
Culham Science Centre
, Abingdon, Oxfordshire OX14 3DB, United Kingdom
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a)
Electronic mail: S.C.Chapman@warwick.ac.uk
Phys. Plasmas 22, 112119 (2015)
Article history
Received:
July 06 2015
Accepted:
November 03 2015
Citation
W. N. Lai, S. C. Chapman, R. O. Dendy; Velocity space evolution of a minority energetic electron population undergoing the anomalous Doppler instability. Phys. Plasmas 1 November 2015; 22 (11): 112119. https://doi.org/10.1063/1.4936101
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