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A large-signal theory of bunching in the triaxial klystron amplifier

Published online by Cambridge University Press:  25 September 2012

Zumin Qi ,
Jun Zhang ,
Huihuang Zhong  and
Zehai Zhang
Zumin Qi*
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
Jun Zhang
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
Huihuang Zhong
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
Zehai Zhang
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
*
Address correspondence and reprint requests to: Zumin Qi, College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China. E-mail: qizumin@yahoo.cn
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Abstract

A large-signal theory of bunching of an intense relativistic electron beam with both velocity and density modulation in the triaxial klystron has been derived in this paper. The theory presents both the harmonic current and the transient velocity in the bunching process, and expresses the velocity modulation directly by the modulation voltage that is easier to be attained and controlled in practice. A few checks are performed on the large-signal theory by particle-in-cell simulation that suggested the large-signal theory of bunching can successfully predict the first-order harmonic current and the velocity on a beam, with both velocity and density modulation, after interacting with a modulation voltage on the order of magnitude with the beam voltage. The theory described in this paper can accommodate general situations such as the bunching of a modulated beam after interacting with a buncher cavity of the Triaxial klystron amplifier.

Keywords

High power microwaveIntense relativistic electron beamLarge-signal theoryTransition radiationTriaxial klystron amplifier
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 4 , December 2012 , pp. 569 - 574
Copyright
Copyright © Cambridge University Press 2012

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