Large-signal theory of gyro traveling wave tubes at cyclotron harmonics

Author

Nusinovich, Gregory S. ; Li, Hai

Author_Institution

Lab. for Plasma Res., Maryland Univ., College Park, MD, USA

Volume

20

Issue

3

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

170

Lastpage

175

Abstract

A nonlinear theory of gyrotron traveling wave tubes (gyro-TWTs) at cyclotron harmonics has been developed taking into account the electron velocity spread and the possibility of operating with significant Doppler frequency up-shift (CARM operation). It is shown that the orbital efficiency of the relativistic gyro-TWT operating at the second cyclotron harmonic with large frequency up-conversion may exceed 60%. It is also shown that the influence of the axial inhomogeneity of the wave field on the relation between amplitudes of electric and magnetic fields of the wave causes small changes in the efficiency of gyro-TWTs. The results obtained demonstrate the sensitivity of the harmonic gyro-TWT efficiency with respect to electron velocity spread at different axial wave numbers. The expressions for the gain are derived and discussed,

Keywords

gyrotrons; harmonic generation; relativistic electron beam tubes; travelling-wave-tubes; CARM operation; Doppler frequency up-shift; cyclotron harmonics; electric field amplitude; electron velocity spread; gain; gyro traveling wave tubes; large signal theory; magnetic field amplitude; nonlinear theory; orbital efficiency; relativistic gyro-TWT; second cyclotron harmonic; wave field axial inhomogeneity; Concrete; Cyclotrons; Electromagnetic radiation; Electron tubes; Equations; Frequency; Klystrons; Magnetic fields; Nonuniform electric fields; Resonance;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.142817

Filename

142817