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Research at St Andrews

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

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

Author(s)

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

School/Research organisations

Abstract

Auroral Kilometric Radiation (AKR) emissions occur at frequencies similar to 300kHz polarised in the X-mode with efficiencies similar to 1-2% [1,2] in the auroral density cavity in the polar regions of the Earth's magnetosphere, a region of low density plasma similar to 3200km above the Earth's surface, where electrons are accelerated down towards the Earth whilst undergoing magnetic compression. As a result of this magnetic compression the electrons acquire a horseshoe distribution function in velocity space. Previous theoretical studies have predicted that this distribution is capable of driving the cyclotron maser instability. To test this theory a scaled laboratory experiment was constructed to replicate this phenomenon in a controlled environment, [3-5] whilst 2D and 3D simulations are also being conducted to predict the experimental radiation power and mode, [6-9]. The experiment operates in the microwave frequency regime and incorporates a region of increasing magnetic field as found at the Earth's pole using magnet solenoids to encase the cylindrical interaction waveguide through which an initially rectilinear electron beam (12A) was accelerated by a 75keV pulse. Experimental results showed evidence of the formation of the horseshoe distribution function. The radiation was produced in the near cut-off TE01 mode, comparable with X-mode characteristics, at 4.42GHz. Peak microwave output power was measured similar to 35kW and peak efficiency of emission similar to 2%, [3]. A Penning trap was constructed and inserted into the interaction waveguide to enable generation of a background plasma which would lead to closer comparisons with the magnetospheric conditions. Initial design and measurements are presented showing the principle features of the new geometry.

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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 pages6
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

  • Cyclotron maser radiation, Laboratory plasmas, Space, Distributions, Generation

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  1. Numerical simulation of unconstrained cyclotron resonant maser emission

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

  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: 136123926

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