Modelling of the anomalous Doppler resonance for a laboratory experiment

R. Bryson, D. C. Speirs, M. King, I. Vorgul, R. A. Cairns, A. D. R. Phelps, R. Bingham, S. L. McConville, K. M. Gillespie, K. Ronald

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

The anomalous Doppler resonance is an instability that occurs due to coupling between an electromagnetic wave and a negative harmonic of the electron cyclotron frequency, as such this regime is only achievable in slow-wave media, including plasma.[1-2]In magnetic confinement fusion experiments the generation of fast electrons by Lower Hybrid Current Drive can lead to the criterion for which the anomalous Doppler resonance is fulfilled.[3]A simulation of non-thermal electrons drifting at relativistic velocities along a magnetic field with a background plasma has been developed in the 3D Particle-in-Cell code VORPAL. By tailoring the fast electron distribution so that the number density decreases as the velocity of the electrons increases suppression of the two-stream and Cherenkov instabilities can be achieved. From these experiments indications of the anomalous Doppler instability have been observed. An experiment to test the prediction of simulations is being developed at University of Strathclyde, with current work focussing on the production of energetic electrons to mimic the energetic tail critical to the anomalous Doppler instability. The results of the experiment will benchmark the code and be used to inform further simulations which will have parameters relevant to magnetic confinement fusion and astrophysical phenomena.

LanguageEnglish
Title of host publication40th EPS Conference on Plasma Physics, EPS 2013
EditorsV. Naulin, C. Angioni, M. Borghesi, S. Ratynskaia, S. Poedts, T. Donné, T. Kurki-Suonio, S. Äkäslompolo, A. Hakola, M. Airila
Place of PublicationMulhouse
Pages1590-1593
Number of pages4
Volume2
Publication statusPublished - 1 Jul 2013
Event40th EPS Conference on Plasma Physics, EPS 2013 - Espoo, Finland
Duration: 1 Jul 20135 Jul 2013

Publication series

NameEurophysics Conference Abstracts
PublisherEuropean Physical Society
Volume37D

Conference

Conference40th EPS Conference on Plasma Physics, EPS 2013
CountryFinland
CityEspoo
Period1/07/135/07/13

Fingerprint

electrons
fusion
relativistic velocity
simulation
cyclotron frequency
electron distribution
electromagnetic radiation
astrophysics
indication
retarding
harmonics
predictions
magnetic fields

Keywords

  • Doppler resonance
  • electromagnetic waves
  • electron cyclotron frequency
  • plasma
  • magnetic confinement fusion
  • simulations
  • energetic electrons

Cite this

Bryson, R., Speirs, D. C., King, M., Vorgul, I., Cairns, R. A., Phelps, A. D. R., ... Ronald, K. (2013). Modelling of the anomalous Doppler resonance for a laboratory experiment. In V. Naulin, C. Angioni, M. Borghesi, S. Ratynskaia, S. Poedts, T. Donné, T. Kurki-Suonio, S. Äkäslompolo, A. Hakola, ... M. Airila (Eds.), 40th EPS Conference on Plasma Physics, EPS 2013 (Vol. 2, pp. 1590-1593). (Europhysics Conference Abstracts; Vol. 37D). Mulhouse.
Bryson, R. ; Speirs, D. C. ; King, M. ; Vorgul, I. ; Cairns, R. A. ; Phelps, A. D. R. ; Bingham, R. ; McConville, S. L. ; Gillespie, K. M. ; Ronald, K. / Modelling of the anomalous Doppler resonance for a laboratory experiment. 40th EPS Conference on Plasma Physics, EPS 2013. editor / V. Naulin ; C. Angioni ; M. Borghesi ; S. Ratynskaia ; S. Poedts ; T. Donné ; T. Kurki-Suonio ; S. Äkäslompolo ; A. Hakola ; M. Airila. Vol. 2 Mulhouse, 2013. pp. 1590-1593 (Europhysics Conference Abstracts).
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Bryson, R, Speirs, DC, King, M, Vorgul, I, Cairns, RA, Phelps, ADR, Bingham, R, McConville, SL, Gillespie, KM & Ronald, K 2013, Modelling of the anomalous Doppler resonance for a laboratory experiment. in V Naulin, C Angioni, M Borghesi, S Ratynskaia, S Poedts, T Donné, T Kurki-Suonio, S Äkäslompolo, A Hakola & M Airila (eds), 40th EPS Conference on Plasma Physics, EPS 2013. vol. 2, Europhysics Conference Abstracts, vol. 37D, Mulhouse, pp. 1590-1593, 40th EPS Conference on Plasma Physics, EPS 2013, Espoo, Finland, 1/07/13.

Modelling of the anomalous Doppler resonance for a laboratory experiment. / Bryson, R.; Speirs, D. C.; King, M.; Vorgul, I.; Cairns, R. A.; Phelps, A. D. R.; Bingham, R.; McConville, S. L.; Gillespie, K. M.; Ronald, K.

40th EPS Conference on Plasma Physics, EPS 2013. ed. / V. Naulin; C. Angioni; M. Borghesi; S. Ratynskaia; S. Poedts; T. Donné; T. Kurki-Suonio; S. Äkäslompolo; A. Hakola; M. Airila. Vol. 2 Mulhouse, 2013. p. 1590-1593 (Europhysics Conference Abstracts; Vol. 37D).

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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N2 - The anomalous Doppler resonance is an instability that occurs due to coupling between an electromagnetic wave and a negative harmonic of the electron cyclotron frequency, as such this regime is only achievable in slow-wave media, including plasma.[1-2]In magnetic confinement fusion experiments the generation of fast electrons by Lower Hybrid Current Drive can lead to the criterion for which the anomalous Doppler resonance is fulfilled.[3]A simulation of non-thermal electrons drifting at relativistic velocities along a magnetic field with a background plasma has been developed in the 3D Particle-in-Cell code VORPAL. By tailoring the fast electron distribution so that the number density decreases as the velocity of the electrons increases suppression of the two-stream and Cherenkov instabilities can be achieved. From these experiments indications of the anomalous Doppler instability have been observed. An experiment to test the prediction of simulations is being developed at University of Strathclyde, with current work focussing on the production of energetic electrons to mimic the energetic tail critical to the anomalous Doppler instability. The results of the experiment will benchmark the code and be used to inform further simulations which will have parameters relevant to magnetic confinement fusion and astrophysical phenomena.

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KW - Doppler resonance

KW - electromagnetic waves

KW - electron cyclotron frequency

KW - plasma

KW - magnetic confinement fusion

KW - simulations

KW - energetic electrons

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Bryson R, Speirs DC, King M, Vorgul I, Cairns RA, Phelps ADR et al. Modelling of the anomalous Doppler resonance for a laboratory experiment. In Naulin V, Angioni C, Borghesi M, Ratynskaia S, Poedts S, Donné T, Kurki-Suonio T, Äkäslompolo S, Hakola A, Airila M, editors, 40th EPS Conference on Plasma Physics, EPS 2013. Vol. 2. Mulhouse. 2013. p. 1590-1593. (Europhysics Conference Abstracts).