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Proceedings Paper

Operation of a long-pulse backward-wave oscillator using a disk cathode
Author(s): Kelly Hahn; Mikhail I. Fuks; Edl Schamiloglu
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Paper Abstract

Recent work at the University of New Mexico has studied the use of a circular disk cathode as the electron source in a long-pulse Backward Wave Oscillator (BWO) experiment. The use of this cathode was motivated by recent studies by Loza and Strelkov of the General Physics Institute in Russia that demonstrated that a relativistic electron beam with stable cross section could be sustained for over one microsecond. In our first investigations using this new cathode configuration we found that the microwave pulse length generated from a long pulse BWO increased somewhat compared to the case when a traditional annular `cookie-cutter' cathode was used. We attribute this pulse lengthening to the hypothesis that the disk cathode generates a relativistic electron beam that is less likely to radially expand, thereby minimizing wall interception and the generation of unwanted plasma. In this paper we describe details of work- in-progress relating to a comparison of microwave generation from a disk cathode and annular cathode in a long-pulse BWO.

Paper Details

Date Published: 15 August 2001
PDF: 9 pages
Proc. SPIE 4371, Intense Microwave Pulses VIII, (15 August 2001); doi: 10.1117/12.436932
Show Author Affiliations
Kelly Hahn, Univ. of New Mexico (United States)
Mikhail I. Fuks, Univ. of New Mexico (United States)
Edl Schamiloglu, Univ. of New Mexico (United States)

Published in SPIE Proceedings Vol. 4371:
Intense Microwave Pulses VIII
Howard E. Brandt, Editor(s)

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