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Pulse-Stimulated Radiation from a Plasma at Harmonics of the Gyrofrequency

Kegel, W. H. (1967) Pulse-Stimulated Radiation from a Plasma at Harmonics of the Gyrofrequency. Plasma Physics, 9 (3). pp. 339-349. ISSN 0032-1028. doi:10.1088/0032-1028/9/3/305.

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A magneto-plasma excited by two short microwave pulses at the electron gyrofrequency or a multiple thereof, which have a time separation τ, is considered in the single particle approach. Due to non-linearities there arise after the second pulse, radiation maxima at the gyrofrequency and its harmonics. In a situation where the time separation of these maxima is τ* (in the simplest case τ* = τ) at the fundamental, it is τ*/n at the n-th harmonic. As the resonances at the harmonics are a finite Larmor radius effect, excitation at these frequencies requires a non-zero initial energy. As an example, the case is studied where the first pulse is at the gyrofrequency and the second at the second harmonic. In this case radiation maxima at 2ω_c occur at times t_ℓ = ℓτ (ℓ = 1, 2, 3...) after the second pulse, at the fundamental, maxima arise at times t_ℓ = (2ℓ - 1)τ. If there is no non-linearity involved other than the non-linear driving force, during the second pulse there arises only one radiation maximum at t = τ.

Item Type:Article
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Additional Information:© 1967 IOP Publishing. Received 29 September 1966. Fruitful discussions with R. W. Gould, K. S. H. Lee and D. Montgomery are gratefully acknowledged.
Group:Electron Tube and Microwave Laboratory
Funding AgencyGrant Number
Office of Naval Research (ONR)220(50)
Issue or Number:3
Record Number:CaltechAUTHORS:20190327-122016966
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94214
Deposited By: Melissa Ray
Deposited On:28 Mar 2019 15:21
Last Modified:12 Jul 2022 19:45

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