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Proceedings Paper

Influence of near-surface plasma layer on the wide-bandwidth dielectric Cherenkov maser operation
Author(s): Anatoli S. Shlapakovski; Gennadi Melnikov; Anatoli Petrov
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Paper Abstract

The results of experimental tests of the wide-bandwidth relativistic microwave amplifier,--dielectric Cherenkov maser,--are reported that revealed plasma presence in its interaction space, and the analysis of electromagnetic properties of a hybrid system,--dielectric-lined waveguide loaded with a plasma layer,--is presented. Experiments with the high-current electron beam showed the effect of strong enhancement of output microwave power by means of an external driver signal at different X-band frequencies, however, the said enhancement was poorly reproducible. Circumstantial evidences were obtained indicating that plasma could be produced at the dielectric surface from electron bombardment of the liner as well as from an rf breakdown caused by a microwave drive signal. The dispersion relation of the system with magnetized near-surface hollow plasma have been derived, and the spectra and electromagnetic field radial distributions for both waveguide and plasma modes have been analyzed depending on the plasma density and layer thickness. It has been found that for dense plasma, even a very thin layer gives a strong frequency upshift of a waveguide mode and reduces its coupling impedance at a given frequency whereas plasma of modest density improves the coupling impedance. Features of usual and hybrid waveguide and plasma modes are discussed in detail. It has been shown that for the hollow plasma configuration, a hybrid plasma mode is characterized with the longitudinal electric field component sign change across the layer.

Paper Details

Date Published: 14 July 2000
PDF: 12 pages
Proc. SPIE 4031, Intense Microwave Pulses VII, (14 July 2000); doi: 10.1117/12.391802
Show Author Affiliations
Anatoli S. Shlapakovski, Tomsk Polytechnic Univ. (Russia)
Gennadi Melnikov, Tomsk Polytechnic Univ. (Russia)
Anatoli Petrov, Tomsk Polytechnic Univ. (Russia)

Published in SPIE Proceedings Vol. 4031:
Intense Microwave Pulses VII
Howard E. Brandt, Editor(s)

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