Numerical simulation of unconstrained cyclotron resonant maser emission
Numerical simulation of unconstrained cyclotron resonant maser emission
复制标题
无约束回旋加速器共振脉泽发射的数值模拟
DOI:
10.1088/1742-6596/511/1/012052
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Speirs D
中科院分区:
文献类型:
--
作者:
Speirs D
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 2.68 GHz, 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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影响因子:
3.8
作者:
K. Ronald;S. McConville;D. Speirs;A. Phelps;C. Robertson;C. Whyte;Wenlong He;K. Gillespie;A. Cross;R. Bingham
通讯作者:
R. Bingham
影响因子:
2.2
作者:
D. Speirs;S. McConville;K. Gillespie;K. Ronald;A. Phelps;A. Cross;R. Bingham;C. Robertson;C. Whyte;I. Vorgul;R. A. Cairns;B. Kellett
通讯作者:
D. Speirs;S. McConville;K. Gillespie;K. Ronald;A. Phelps;A. Cross;R. Bingham;C. Robertson;C. Whyte;I. Vorgul;R. A. Cairns;B. Kellett
影响因子:
2.2
作者:
K. Ronald;D. Speirs;S. McConville;A. Phelps;C. Robertson;C. Whyte;Wenlong He;K. Gillespie;A. Cross;R. Bingham
通讯作者:
R. Bingham
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
D. Gurnett
通讯作者:
D. Gurnett
影响因子:
1.6
作者:
R. Bingham;B. Kellett;R. A. Cairns;I. Vorgul;A. Phelps;K. Ronald;D. Speirs
通讯作者:
D. Speirs