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Theory of Pulse Stimulated Radiation from a Plasma Caused by the Relativistic Mass Effect

Kegel, Wilhelm H. (1965) Theory of Pulse Stimulated Radiation from a Plasma Caused by the Relativistic Mass Effect. Electron Tube and Microwave Laboratory Technical Report, 27. California Institute of Technology , Pasadena, CA. (Submitted) http://resolver.caltech.edu/CaltechAUTHORS:20190325-123646311

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Abstract

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 hot 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. 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 a cold plasma with field inhomogeneities, and at t = (Kτ + LT)/|1 ± D ± D_2| in the case of a hot plasma. 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.


Item Type:Report or Paper (Technical Report)
Additional Information:It is a pleasure to thank Prof. R. W. Gould for several very stimulating discussions. The results of Section III were partially derived in collaboration with him.
Group:Electron Tube and Microwave Laboratory
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)220(50)
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Electron Tube and Microwave Laboratory Technical Report27
DOI:10.7907/CZ9B-QJ31
Record Number:CaltechAUTHORS:20190325-123646311
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190325-123646311
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94121
Collection:CaltechAUTHORS
Deposited By: Melissa Ray
Deposited On:25 Mar 2019 20:53
Last Modified:04 Jun 2019 21:39

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