Intense space-charge beam physics relevant to relativistic klystron amplifiers

Author

Carlsten, B.E. ; Faehl, R.J. ; Fazio, M.V. ; Haynes, W.B. ; Stringfield, R.M.

Author_Institution

Los Alamos Nat. Lab., NM, USA

Volume

22

Issue

5

fYear

1994

fDate

10/1/1994 12:00:00 AM

Firstpage

719

Lastpage

729

Abstract

In this paper, we examine intense space-charge beam physics that is relevant to beam bunching and extraction in a mildly relativistic klystron amplifier, and give numerical examples for a 5 kA, 500 keV electron beam in a 1.3 GHz structure. Much of the peculiar beam physics in these types of devices results from the partitioning of beam energy into kinetic and potential parts. Both tenuous-nonrelativistic and intense-relativistic beams produce effects different in nature from those produced by intense, mildly relativistic beams because the potential energy requirements are either negligible or fixed. In particular, we demonstrate anomalous beam bunching aided by the nonlinear potential requirements and we discuss maximum power extraction as a function of beam bunching. We show that although the space-charge effects can produce quite high harmonic current content, the maximum power extraction from the beam into RF typically occurs at relatively modest bunching

Keywords

electron beams; harmonics; klystrons; microwave amplifiers; relativistic electron beam tubes; space charge; 1.3 GHz; 5 kA; 500 keV; beam bunching; beam energy partitioning; energy requirements; harmonic current content; intense space-charge beam physics; maximum power extraction; relativistic klystron amplifiers; Electron beams; Kinetic theory; Klystrons; Optical modulation; Physics; Pulse amplifiers; Pulse compression methods; Radio frequency; Space charge; Weapons;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.338288

Filename

338288