Microwave generation from an electron horseshoe distribution: Theory and experiment

K Ronald, A D R Phelps, R Bingham, D C Speirs, A W Cross, I Vorgul, R A Cairns, B J Kellett, C G Whyte, C W Robertson

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


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.

Original languageEnglish
Title of host publicationHigh Energy Density and High Power RF
EditorsDK Abe, GS Nusinovich
Place of PublicationMelville, NY
PublisherAmerican Institute of Physics
Number of pages6
ISBN (Print)0-7354-0298-1
Publication statusPublished - 2006
Event7th Workshop on High Energy Density and High Power RF - Kalamata
Duration: 13 Jun 200517 Jun 2005

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243x
ISSN (Electronic)1551-7616


Conference7th Workshop on High Energy Density and High Power RF


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