skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A high-power two stage traveling-wave tube amplifier

Abstract

Results are presented on the development of a two stage high-efficiency, high-power 8.76-GHz traveling-wave tube amplifier. The work presented augments previously reported data on a single stage amplifier and presents new data on the operational characteristics of two identical amplifiers operated in series and separated from each other by a sever. Peak powers of 410 MW have been obtained over the complete pulse duration of the device, with a conversion efficiency from the electron beam to microwave energy of 45%. In all operating conditions the severed amplifier showed a sideband''-like structure in the frequency spectrum of the microwave radiation. A similar structure was apparent at output powers in excess of 70 MW in the single stage device. The frequencies of the sidebands'' are not symmetric with respect to the center frequency. The maximum, single frequency, average output power was 210 MW corresponding to an amplifier efficiency of 24%. Simulation data is also presented that indicates that the short amplifiers used in this work exhibit significant differences in behavior from conventional low-power amplifiers. These include finite length effects on the gain characteristics, which may account for the observed narrow bandwidth of the amplifiers and for the appearance of the sidebands. Itmore » is also found that the bunching length for the beam may be a significant fraction of the total amplifier length.« less

Authors:
; ; ; ;  [1]
  1. Laboratory of Plasma Studies and School of Electrical Engineering, Cornell University, Ithaca, New York 14853 (USA)
Publication Date:
OSTI Identifier:
5467924
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics; (USA)
Additional Journal Information:
Journal Volume: 70:1; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; TRAVELLING WAVE TUBES; EFFICIENCY; BEAM BUNCHING; DESIGN; GAIN; MICROWAVE AMPLIFIERS; OPERATION; RELIABILITY; AMPLIFICATION; AMPLIFIERS; BEAM DYNAMICS; ELECTRON TUBES; ELECTRONIC EQUIPMENT; EQUIPMENT; MICROWAVE EQUIPMENT; MICROWAVE TUBES; 640301* - Atomic, Molecular & Chemical Physics- Beams & their Reactions

Citation Formats

Shiffler, D, Nation, J A, Schachter, L, Ivers, J D, and Kerslick, G S. A high-power two stage traveling-wave tube amplifier. United States: N. p., 1991. Web. doi:10.1063/1.350322.
Shiffler, D, Nation, J A, Schachter, L, Ivers, J D, & Kerslick, G S. A high-power two stage traveling-wave tube amplifier. United States. doi:10.1063/1.350322.
Shiffler, D, Nation, J A, Schachter, L, Ivers, J D, and Kerslick, G S. Mon . "A high-power two stage traveling-wave tube amplifier". United States. doi:10.1063/1.350322.
@article{osti_5467924,
title = {A high-power two stage traveling-wave tube amplifier},
author = {Shiffler, D and Nation, J A and Schachter, L and Ivers, J D and Kerslick, G S},
abstractNote = {Results are presented on the development of a two stage high-efficiency, high-power 8.76-GHz traveling-wave tube amplifier. The work presented augments previously reported data on a single stage amplifier and presents new data on the operational characteristics of two identical amplifiers operated in series and separated from each other by a sever. Peak powers of 410 MW have been obtained over the complete pulse duration of the device, with a conversion efficiency from the electron beam to microwave energy of 45%. In all operating conditions the severed amplifier showed a sideband''-like structure in the frequency spectrum of the microwave radiation. A similar structure was apparent at output powers in excess of 70 MW in the single stage device. The frequencies of the sidebands'' are not symmetric with respect to the center frequency. The maximum, single frequency, average output power was 210 MW corresponding to an amplifier efficiency of 24%. Simulation data is also presented that indicates that the short amplifiers used in this work exhibit significant differences in behavior from conventional low-power amplifiers. These include finite length effects on the gain characteristics, which may account for the observed narrow bandwidth of the amplifiers and for the appearance of the sidebands. It is also found that the bunching length for the beam may be a significant fraction of the total amplifier length.},
doi = {10.1063/1.350322},
journal = {Journal of Applied Physics; (USA)},
issn = {0021-8979},
number = ,
volume = 70:1,
place = {United States},
year = {1991},
month = {7}
}