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Pulse-stimulated radiation from a plasma due to an energy-dependent gyrofrequency

Kegel, W. H. (1967) Pulse-stimulated radiation from a plasma due to an energy-dependent gyrofrequency. Plasma Physics, 9 (1). pp. 23-38. ISSN 0032-1028. doi:10.1088/0032-1028/9/1/304.

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A plasma excited by two short pulses at the electron gyrofrequency which have a time separation τ, is considered in the single particle approach. It is shown that the relativistic mass effect can lead to a series of radiation maxima after the second pulse. In the case of a cold plasma in an inhomogeneous magnetic field these maxima arise at multiples of the time τ; in the case of a warm plasma in a homogeneous magnetic field at multiples of τ/|1 ± D|, where D is the strength of the second pulse relative to the first one. The shape of the radiation maxima is given by the square of the Fourier transform of the distribution of the inhomogeneities or the initial energies, respectively. The two effects have the tendency to cancel each other. (i) If the plasma is excited by three pulses, the time separation of the second and third pulse being T, radiation maxima occur at times t = Kτ + LT, (±K, L = 0, 1, 2,... but t > 0) after the third pulse in the case of cold plasma with field inhomogeneities, and at t = (Kτ + LT)/|1 ± D ± D_2| in the case of a warm plasma. (ii) If collisions are taken into account the dependence on T of the radiation maxima with L = 0 is determined by inelastic collisions only, while the other decay times are determined by all kinds of collisions.

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Additional Information:© 1967 Pergamon Press. Received 22 May 1966. This work was sponsored by the U.S. Navy, Office of Naval Research. It is a pleasure to thank Professor R. W. Gould for several very stimulating discussions. The results of Section 3 were partially derived in collaboration with him (Kegel and Gould, 1965).
Group:Electron Tube and Microwave Laboratory
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:Plasma physics
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Other Numbering System NameOther Numbering System ID
Electron Tube and Microwave Laboratory Technical Report35
Issue or Number:1
Classification Code:PACS: 52.30.Gz; 52.25.Kn; 52.25.Fi; 52.25.Gj
Record Number:CaltechAUTHORS:20121023-145118475
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Official Citation:Kegel W. H. (1967) Plasma Phys. 9 23.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35047
Deposited By: Melissa Ray
Deposited On:23 Oct 2012 22:12
Last Modified:12 Jul 2022 19:47

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