Numerical simulation of unconstrained cyclotron resonant maser emission

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

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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.
Original languageEnglish
Article number012052
Number of pages5
JournalJournal of Physics: Conference Series
Volume511
Issue number1
DOIs
Publication statusPublished - 1 Jan 2014
Event15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010) - Santiago, Chile
Duration: 8 Aug 201013 Aug 2010

Keywords

  • electron beam
  • electron cyclotron maser
  • auroral cyclotron maser
  • Auroral kilometric radiation
  • cyclotron maser radiation
  • PiC code simulation

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