Microwave generation from an electron horseshoe distribution: theory and experiment

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

When a beam of electrons encounters an increasing magnetic field along its vector of motion, conservation of the magnetic moment results in the formation of a crescent or horseshoe-shaped velocity distribution. A scenario analogous to this occurs in the terrestrial auroral zone where particles are accelerated into the polar regions of the earth's magnetic dipole and expand adiabatically in velocity space. The resultant horseshoe-shaped velocity distribution has been shown to be unstable to a cyclotron-maser type instability [1-3]. This instability has been postulated as the mechanism responsible for auroral kilometric radiation and also nonthermal radiation from other astrophysical bodies [4]. In this paper we describe both theory, simulations and a laboratory experiment to investigate the generation of microwave radiation when an electron beam is magnetically compressed by a factor of 35.
LanguageEnglish
Title of host publicationHigh Energy Density and High Power RF
Place of PublicationMelville, N.Y, USA
Pages246-251
Number of pages5
Volume807
Publication statusPublished - 2006

Publication series

NameAmerican Institute of Physics Conference Proceedings
PublisherAmerican Institute of Physics

Fingerprint

velocity distribution
microwaves
auroral zones
nonthermal radiation
masers
magnetic dipoles
encounters
polar regions
cyclotrons
conservation
astrophysics
electrons
magnetic moments
electron beams
radiation
magnetic fields
simulation

Keywords

  • auroral region
  • cyclotron instability
  • kilometric radiation
  • scaled microwave experiment

Cite this

Ronald, K., Phelps, A. D. R., Bingham, R., Speirs, D., Cross, A. W., Vorgul, I., ... Robertson, C. (2006). Microwave generation from an electron horseshoe distribution: theory and experiment. In High Energy Density and High Power RF (Vol. 807, pp. 246-251). (American Institute of Physics Conference Proceedings). Melville, N.Y, USA.
Ronald, K. ; Phelps, A.D.R. ; Bingham, R. ; Speirs, David ; Cross, A.W. ; Vorgul, I. ; Cairns, R.A. ; Kellett, B.J. ; Whyte, C.G. ; Robertson, Craig. / Microwave generation from an electron horseshoe distribution: theory and experiment. High Energy Density and High Power RF. Vol. 807 Melville, N.Y, USA, 2006. pp. 246-251 (American Institute of Physics Conference Proceedings).
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abstract = "When a beam of electrons encounters an increasing magnetic field along its vector of motion, conservation of the magnetic moment results in the formation of a crescent or horseshoe-shaped velocity distribution. A scenario analogous to this occurs in the terrestrial auroral zone where particles are accelerated into the polar regions of the earth's magnetic dipole and expand adiabatically in velocity space. The resultant horseshoe-shaped velocity distribution has been shown to be unstable to a cyclotron-maser type instability [1-3]. This instability has been postulated as the mechanism responsible for auroral kilometric radiation and also nonthermal radiation from other astrophysical bodies [4]. In this paper we describe both theory, simulations and a laboratory experiment to investigate the generation of microwave radiation when an electron beam is magnetically compressed by a factor of 35.",
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Ronald, K, Phelps, ADR, Bingham, R, Speirs, D, Cross, AW, Vorgul, I, Cairns, RA, Kellett, BJ, Whyte, CG & Robertson, C 2006, Microwave generation from an electron horseshoe distribution: theory and experiment. in High Energy Density and High Power RF. vol. 807, American Institute of Physics Conference Proceedings, Melville, N.Y, USA, pp. 246-251.

Microwave generation from an electron horseshoe distribution: theory and experiment. / Ronald, K.; Phelps, A.D.R.; Bingham, R.; Speirs, David; Cross, A.W.; Vorgul, I.; Cairns, R.A.; Kellett, B.J.; Whyte, C.G.; Robertson, Craig.

High Energy Density and High Power RF. Vol. 807 Melville, N.Y, USA, 2006. p. 246-251 (American Institute of Physics Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Microwave generation from an electron horseshoe distribution: theory and experiment

AU - Ronald, K.

AU - Phelps, A.D.R.

AU - Bingham, R.

AU - Speirs, David

AU - Cross, A.W.

AU - Vorgul, I.

AU - Cairns, R.A.

AU - Kellett, B.J.

AU - Whyte, C.G.

AU - Robertson, Craig

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 - 2006

Y1 - 2006

N2 - When a beam of electrons encounters an increasing magnetic field along its vector of motion, conservation of the magnetic moment results in the formation of a crescent or horseshoe-shaped velocity distribution. A scenario analogous to this occurs in the terrestrial auroral zone where particles are accelerated into the polar regions of the earth's magnetic dipole and expand adiabatically in velocity space. The resultant horseshoe-shaped velocity distribution has been shown to be unstable to a cyclotron-maser type instability [1-3]. This instability has been postulated as the mechanism responsible for auroral kilometric radiation and also nonthermal radiation from other astrophysical bodies [4]. In this paper we describe both theory, simulations and a laboratory experiment to investigate the generation of microwave radiation when an electron beam is magnetically compressed by a factor of 35.

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KW - auroral region

KW - cyclotron instability

KW - kilometric radiation

KW - scaled microwave experiment

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BT - High Energy Density and High Power RF

CY - Melville, N.Y, USA

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Ronald K, Phelps ADR, Bingham R, Speirs D, Cross AW, Vorgul I et al. Microwave generation from an electron horseshoe distribution: theory and experiment. In High Energy Density and High Power RF. Vol. 807. Melville, N.Y, USA. 2006. p. 246-251. (American Institute of Physics Conference Proceedings).