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Proceedings Paper

Halo formation in intense electron beams in high-power klystron amplifiers
Author(s): Renato Pakter; Chiping Chen
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Paper Abstract

An important issue in the design of high-power microwave sources is how to prevent high-intensity relativistic electron beams from forming halos because they cause electron beam losses and radio-frequency pulse shortening. In this paper, we study the behavior of a high-intense electron beam under a current-oscillation-induced mismatch between the beam and the magnetic focusing field, using a 2D self-consistent electrostatic model. For high-intensity electron beams, it is found from the self-consistent simulations that sizable halos appear after the beam envelope undergoes several mismatched oscillations, depending on the amplitude of mismatched beam envelope oscillations. Detailed simulation results are presented for the choice of system parameters corresponding to the 50 MW, 11.4 GHz periodic permanent magnetic focusing klystron experiment at the Stanford Linear Accelerator Center. Moreover, it is found that the process of halo formation in a uniform-solenoidal focusing klystron is essentially the same as in the PPM focusing klystron with comparable system parameters.

Paper Details

Date Published: 1 July 1999
PDF: 9 pages
Proc. SPIE 3702, Intense Microwave Pulses VI, (1 July 1999); doi: 10.1117/12.351214
Show Author Affiliations
Renato Pakter, Massachusetts Institute of Technology (United States)
Chiping Chen, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3702:
Intense Microwave Pulses VI
Howard E. Brandt, Editor(s)

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