Explosive amplification of an electromagnetic field in a magnetized flow of accelerated-electron oscillators.
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The possibility of the explosive amplification of electromagnetic field by an ensemble of harmonic oscillators (with arbitrary population of excited energy levels) is established. The amplification occurs if the frequency of oscillators is chirped under the action of an external force. The analysis is given for the magnetized flow of electron cyclotron oscillators that are accelerated by the quasistationary electric field along the quasihomogeneous magnetic field. It is shown analytically that in such a nonsteady flow the initial energy of coherent oscillations of gyrating electrons can be efficiently converted into the energy of field as a result of quasiadiabatic tuning of electromagnetic wave frequency to the (Doppler-shifted) electron gyrofrequency. The optimal regime of the flow acceleration is found, in which the almost complete energy transfer occurs during a few periods of plasma oscillations. The proposed mechanism of explosive (nonexponential) amplification principally differs from and can prevail over the known maser and parametric mechanisms of field amplification. © 1996 The American Physical Society.
author list (cited authors)
Belyanin, A. A., & Kocharovsky, V. V
complete list of authors
Belyanin, AA||Kocharovsky, VV