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Relativistic quantum kinetic theory of stimulated bremsstrahlung of an axial vacuum mode by an electron beam travelling in a uniform magnetic field

Published online by Cambridge University Press:  13 March 2009

S. H. Kim
Affiliation:
Department of Physics, University of Texas at Arlington, P.O. Box 19059, Arlington, Texas 76019, U.S.A.

Abstract

Stimulated emission of ordinary plane-polarized electromagnetic waves propagating in the axial direction by a relativistic or non-relativistic electron beam is investigated using a new quantum kinetics based on the Dirac equation. The momentum and energy conservation laws and the time-reversal invariance of the transition probability are used explicitly to calculate the gain without expanding the transition rate as a power series in ħ. It is found that electroncyclotron masing occurs when the longitudinal temperature differs greatly from the transverse temperature for any beam energy. This electron-cyclotron masing is an individual-electron effect, which is not related at all to the phase bunching.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1992

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