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Proceedings Paper

High-power microwave window breakdown under vacuum and atmospheric conditions
Author(s): David Hemmert; Andreas A. Neuber; James C. Dickens; Hermann Krompholz; Lynn L. Hatfield; Magne Kristiansen
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Paper Abstract

Microwave window breakdown is investigated in vacuum and atmospheric conditions. An S-band resonant ring with a frequency of 2.85 GHz and a power of 80 MW with a 4 MW magnetron as a source is used. Window breakdown on the vacuum side is simulated using a dielectric slab partially filling an evacuated waveguide. Various high-speed diagnostic methods yield a complete picture on the breakdown phenomenology, with far reaching similarities to dc surface flashover. During the initiation phase, free electrons are presented, which can be influenced by magnetic fields, followed by a saturated secondary electron avalanche with electron-induced outgassing. Final breakdown occurs in the desorbed gas layer above the surface. In order to simulated window breakdown on the gas-side, a segment of the resonant ring separated by two windows was filled with gas at variable pressure, and breakdown was initiated by field- enhancement tips on one of the gas-side surfaces. Threshold power densities for breakdown are measured, and first results on the phenomenology of this gas breakdown are compared with the processes of flashover in vacuum.

Paper Details

Date Published: 14 July 2000
PDF: 9 pages
Proc. SPIE 4031, Intense Microwave Pulses VII, (14 July 2000);
Show Author Affiliations
David Hemmert, Texas Tech Univ. (United States)
Andreas A. Neuber, Texas Tech Univ. (United States)
James C. Dickens, Texas Tech Univ. (United States)
Hermann Krompholz, Texas Tech Univ. (United States)
Lynn L. Hatfield, Texas Tech Univ. (United States)
Magne Kristiansen, Texas Tech Univ. (United States)

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

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