Operation of a long-pulse backward-wave oscillator using a disk cathode

Kelly Hahn; Mikhail I. Fuks; Edl Schamiloglu

doi:10.1117/12.436932

15 August 2001 Operation of a long-pulse backward-wave oscillator using a disk cathode

Kelly Hahn, Mikhail I. Fuks, Edl Schamiloglu

Proceedings Volume 4371, Intense Microwave Pulses VIII; (2001) https://doi.org/10.1117/12.436932
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

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.

Citation Download Citation

Kelly Hahn, Mikhail I. Fuks, and Edl Schamiloglu "Operation of a long-pulse backward-wave oscillator using a disk cathode", Proc. SPIE 4371, Intense Microwave Pulses VIII, (15 August 2001); https://doi.org/10.1117/12.436932

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