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Research at St Andrews

Numerical simulation of unconstrained cyclotron resonant maser emission

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

Author(s)

D. C. Speirs, K. M. Gillespie, K. Ronald, S. L. McConville, A. D. R. Phelps, A. W. Cross, R. Bingham, B. J. Kellett, R. A. Cairns, I. Vorgul

School/Research organisations

Abstract

When a mainly rectilinear electron beam is subject to significant magnetic compression, conservation of magnetic moment results in the formation of a horseshoe shaped velocity distribution. It has been shown that such a distribution is unstable to cyclotron emission and may be responsible for the generation of Auroral Kilometric Radiation (AKR) an intense rf emission sourced at high altitudes in the terrestrial auroral magnetosphere. PiC code simulations have been undertaken to investigate the dynamics of the cyclotron emission process in the absence of cavity boundaries with particular consideration of the spatial growth rate, spectral output and rf conversion efficiency. Computations reveal that a well-defined cyclotron emission process occurs albeit with a low spatial growth rate compared to waveguide bounded simulations. The rf output is near perpendicular to the electron beam with a slight backward-wave character reflected in the spectral output with a well defined peak at 2.68GHz, just below the relativistic electron cyclotron frequency. The corresponding rf conversion efficiency of 1.1% is comparable to waveguide bounded simulations and consistent with the predictions of kinetic theory that suggest efficient, spectrally well defined radiation emission can be obtained from an electron horseshoe distribution in the absence of radiation boundaries.

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Details

Original languageEnglish
Title of host publication15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010)
Place of PublicationBristol
PublisherIOP Publishing Ltd.
Number of pages5
DOIs
Publication statusPublished - 7 May 2014
Event15th International Congress on Plasma Physics (ICPP) / 13th Latin American Workshop on Plasma Physics (LAWPP) - Santiago, Chile
Duration: 8 Aug 201013 Aug 2010

Publication series

NameJournal of Physics Conference Series
PublisherIOP PUBLISHING LTD
Volume511
ISSN (Print)1742-6588

Conference

Conference15th International Congress on Plasma Physics (ICPP) / 13th Latin American Workshop on Plasma Physics (LAWPP)
CountryChile
Period8/08/1013/08/10

    Research areas

  • Terrestrial kilometric radiation, Laboratory plasmas, Space, Generation

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  1. Scaled Experiment to Investigate Auroral Kilometric Radiation Mechanisms in the Presence of Background Electrons

    McConville, S. L., Ronald, K., Speirs, D. C., Gillespie, K. M., Phelps, A. D. R., Cross, A. W., Bingham, R., Robertson, C. W., Whyte, C. G., He, W., King, M., Bryson, R., Vorgul, I., Cairns, R. A. & Kellett, B. J., 7 May 2014, 15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010). Bristol: IOP Publishing Ltd., 6 p. (Journal of Physics Conference Series; vol. 511).

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

  2. Progress towards numerical and experimental simulations of fusion relevant beam instabilities

    King, M., Bryson, R., Ronald, K., Cairns, R. A., McConville, S. L., Speirs, D. C., Phelps, A. D. R., Bingham, R., Gillespie, K. M., Cross, A. W., Vorgul, I. & Trines, R., 7 May 2014, 15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010). Bristol: IOP Publishing Ltd., 5 p. (Journal of Physics Conference Series; vol. 511).

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

  3. 3D PiC code investigations of Auroral Kilometric Radiation mechanisms

    Gillespie, K. M., McConville, S. L., Speirs, D. C., Ronald, K., Phelps, A. D. R., Bingham, R., Cross, A. W., Robertson, C. W., Whyte, C. G., He, W., Vorgul, I., Cairns, R. A. & Kellett, B. J., 2014, 15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010). Bristol: IOP Publishing Ltd., 6 p. (Journal of Physics Conference Series; vol. 511).

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

  4. Cyclotron maser instability as a source of Auroral Kilometric Radiation

    Vorgul, I., Cairns, R. A., Bingham, R., Ronald, K., Speirs, D., McConville, S., Gillespie, K. & Phelps, A., 2012, 2012 INTERNATIONAL CONFERENCE ON MATHEMATICAL METHODS IN ELECTROMAGNETIC THEORY (MMET). USA: IEEE, p. 340-343 4 p.

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

  5. Auroral magnetospheric cyclotron emission processes: numerical and experimental simulations

    Ronald, K., Speirs, D. C., McConville, S. L., Gillespie, K. M., Phelps, A. D. R., Bingham, R., Vorgul, I., Cairns, R. A., Cross, A. W., Robertson, C. W., Whyte, C. G., He, W. & Kellett, B. J., Jul 2011, In: Plasma Physics and Controlled Fusion. 53, 7, 11 p., 074015.

    Research output: Contribution to journalArticlepeer-review

ID: 136123666

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