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Proceedings Paper

Study of cavity excitation by modulated electron beam in connection with application to klystron amplifiers
Author(s): Han Sup Uhm; Gun-Sik Park; C. M. Armstrong
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Paper Abstract

Based on the equivalent circuit representation of a cavity impedance, a theoretical model of the cavity excitation by a modulated electron beam is developed. The beam current modulation is initiated by the first cavity and amplified in drift section between the first and second cavities. Properties of the second cavity excitation by the beam are described in terms of the phase shift (Psi) and amplitude (phi) 2 of induced voltage in the cavity. The phase shift (Psi) and amplitude (phi) 2 are determined in terms of the frequency difference ((eta) ), the cavity Q-value, the voltage multiplication factor ((chi) ), and magnitude ((phi) 1) of the first cavity voltage. The voltage multiplication factor is proportional to the beam intensity, Q- value, and distance between the first and second cavities. On the other hand, it is inversely proportional to frequency and capacitance of the cavity, and beam electron velocity. Experimental study is carried out by making use of a klystron amplifier operable from 4.4 GHz to 5 GHz. Experimental data from the klystron agree remarkably well with amplifier performance profiles predicted by the theory.

Paper Details

Date Published: 8 July 1993
PDF: 12 pages
Proc. SPIE 1872, Intense Microwave Pulses, (8 July 1993); doi: 10.1117/12.147484
Show Author Affiliations
Han Sup Uhm, Naval Surface Warfare Ctr. (South Korea)
Gun-Sik Park, Naval Research Lab. (United States)
C. M. Armstrong, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 1872:
Intense Microwave Pulses
Howard E. Brandt, Editor(s)

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