Radio frequency resonator structure and diagnostic measurements for a laboratory simulation of Auroral Kilometric Radiation

K. Ronald, David Speirs, S.L. McConville, A.D.R. Phelps, C.W. Robertson, C.G. Whyte, W. He, K.M. Gillespie, Robert Bingham

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Abstract

Auroral Kilometric Radiation is emitted from regions of depleted plasma density in the Earth's polar magnetosphere. The radiation frequency is close to the local electron cyclotron frequency, polarized in the X-mode with an efficiency of ∼ 1%, with power up to 1 GW. Kinetic analysis of the instability in the descending auroral flux indicated that the phenomena scaled with the cyclotron frequency. Therefore, an experimental reproduction of the auroral geometry has been created scaled to laboratory dimensions by raising the radiation frequency to the microwave range. The experiment transports a 75-85 keV electron beam through a region of increasing magnetic flux density, with a mirror ratio of up to 30. The experiments measured the mode, spectrum, power, and conversion efficiency of the emitted radiation as a function of the mirror ratio in two resonance regimes, with frequencies of 4.42 and 11.7 GHz. The microwave diagnostics and measurements will be presented in this paper.
LanguageEnglish
Pages056503
Number of pages8
JournalPhysics of Plasmas
Volume15
Issue number5
DOIs
Publication statusPublished - May 2008

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radio frequencies
resonators
cyclotron frequency
radiation
simulation
mirrors
microwaves
power efficiency
magnetospheres
plasma density
magnetic flux
flux density
electron beams
kinetics
geometry
electrons

Keywords

  • auroral kilometric radiation
  • radiation frequency
  • electron cyclotron frequency
  • magnetized plasmas

Cite this

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title = "Radio frequency resonator structure and diagnostic measurements for a laboratory simulation of Auroral Kilometric Radiation",
abstract = "Auroral Kilometric Radiation is emitted from regions of depleted plasma density in the Earth's polar magnetosphere. The radiation frequency is close to the local electron cyclotron frequency, polarized in the X-mode with an efficiency of ∼ 1{\%}, with power up to 1 GW. Kinetic analysis of the instability in the descending auroral flux indicated that the phenomena scaled with the cyclotron frequency. Therefore, an experimental reproduction of the auroral geometry has been created scaled to laboratory dimensions by raising the radiation frequency to the microwave range. The experiment transports a 75-85 keV electron beam through a region of increasing magnetic flux density, with a mirror ratio of up to 30. The experiments measured the mode, spectrum, power, and conversion efficiency of the emitted radiation as a function of the mirror ratio in two resonance regimes, with frequencies of 4.42 and 11.7 GHz. The microwave diagnostics and measurements will be presented in this paper.",
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T1 - Radio frequency resonator structure and diagnostic measurements for a laboratory simulation of Auroral Kilometric Radiation

AU - Ronald, K.

AU - Speirs, David

AU - McConville, S.L.

AU - Phelps, A.D.R.

AU - Robertson, C.W.

AU - Whyte, C.G.

AU - He, W.

AU - Gillespie, K.M.

AU - Bingham, Robert

N1 - Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.

PY - 2008/5

Y1 - 2008/5

N2 - Auroral Kilometric Radiation is emitted from regions of depleted plasma density in the Earth's polar magnetosphere. The radiation frequency is close to the local electron cyclotron frequency, polarized in the X-mode with an efficiency of ∼ 1%, with power up to 1 GW. Kinetic analysis of the instability in the descending auroral flux indicated that the phenomena scaled with the cyclotron frequency. Therefore, an experimental reproduction of the auroral geometry has been created scaled to laboratory dimensions by raising the radiation frequency to the microwave range. The experiment transports a 75-85 keV electron beam through a region of increasing magnetic flux density, with a mirror ratio of up to 30. The experiments measured the mode, spectrum, power, and conversion efficiency of the emitted radiation as a function of the mirror ratio in two resonance regimes, with frequencies of 4.42 and 11.7 GHz. The microwave diagnostics and measurements will be presented in this paper.

AB - Auroral Kilometric Radiation is emitted from regions of depleted plasma density in the Earth's polar magnetosphere. The radiation frequency is close to the local electron cyclotron frequency, polarized in the X-mode with an efficiency of ∼ 1%, with power up to 1 GW. Kinetic analysis of the instability in the descending auroral flux indicated that the phenomena scaled with the cyclotron frequency. Therefore, an experimental reproduction of the auroral geometry has been created scaled to laboratory dimensions by raising the radiation frequency to the microwave range. The experiment transports a 75-85 keV electron beam through a region of increasing magnetic flux density, with a mirror ratio of up to 30. The experiments measured the mode, spectrum, power, and conversion efficiency of the emitted radiation as a function of the mirror ratio in two resonance regimes, with frequencies of 4.42 and 11.7 GHz. The microwave diagnostics and measurements will be presented in this paper.

KW - auroral kilometric radiation

KW - radiation frequency

KW - electron cyclotron frequency

KW - magnetized plasmas

U2 - 10.1063/1.2856649

DO - 10.1063/1.2856649

M3 - Article

VL - 15

SP - 056503

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

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ER -