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Numerical examination of the operation modes of a weakly relativistic oversized backward wave oscillator

Published online by Cambridge University Press:  20 December 2006

HOSHIYUKI YAMAZAKI ,
HIROKAZU TAKAGI ,
HIDEKAZU TANAKA  and
KAZUO OGURA
HOSHIYUKI YAMAZAKI
Affiliation:
Graduate School of Science and Technology, Niigata University, 8050 Igarashi Ninocho, Niigata 950-2181, Japan
HIROKAZU TAKAGI
Affiliation:
Graduate School of Science and Technology, Niigata University, 8050 Igarashi Ninocho, Niigata 950-2181, Japan
HIDEKAZU TANAKA
Affiliation:
Graduate School of Science and Technology, Niigata University, 8050 Igarashi Ninocho, Niigata 950-2181, Japan
KAZUO OGURA
Affiliation:
Graduate School of Science and Technology, Niigata University, 8050 Igarashi Ninocho, Niigata 950-2181, Japan
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Abstract

Backward wave oscillators (BWOs) have been studied as a candidate high-power microwave source. To increase the operation frequency, an oversized slow-wave structure (SWS) is used. The operation at reduced voltage is preferable for practical applications. This work is aimed at numerically examining the operation mode of a weakly relativistic oversized BWO. We examine not only the axisymmetric transverse magnetic mode but also the non-axisymmetric hybrid modes of the oversized SWS. Both of them are candidates for the operation modes. These modes are surface waves whose fields are concentrated near the SWS wall. They overlap in frequency and are not separated by stop-bands. For an efficient beam interaction, the injected electron beam needs to be controlled more accurately than in the non-oversized SWS case.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 915 - 918
Copyright
2006 Cambridge University Press

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