An Improved Small-Signal Theory of the Triaxial Klystron Amplifier in the Dispersion Relation and Beam Coupling Coefficient

An improved small-signal theory of triaxial klystron amplifiers is proposed with a reduction factor and the beam coupling coefficient being taken into account. It may be concluded that the beam coupling coefficient amends the amplitude of the modulated current and the reduction factor mainly modifie...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2012-01, Vol.40 (1), p.41-47
Main Authors: Qi, Zumin, Zhang, Jun, Zhong, Huihuang, Zhang, Zhehai, Bai, Xianchen, Zhang, Dian, Bai, Zhen
Format: Article
Language:English
Subjects:
Beam coupling coefficient
Cavity resonators
Codes
Conductors
Couplings
Dispersion
dispersion relation
Electric currents
Klystrons
Modulation
Plasma physics
Receivers & amplifiers
small-signal theory
space-charge wave
triaxial klystron amplifier (TKA)
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Summary:An improved small-signal theory of triaxial klystron amplifiers is proposed with a reduction factor and the beam coupling coefficient being taken into account. It may be concluded that the beam coupling coefficient amends the amplitude of the modulated current and the reduction factor mainly modifies the optimum drift distance, at which the modulated current is maximum. The modified theory is validated by means of PIC codes, which indicates that the improved theory predicts the first-order modulation current more accurately than the previous theory.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2011.2172639