Linear theory of slow wave cyclotron interaction in double-ridged folded rectangular waveguide

Author

Ganguly, A.K. ; Choi, J. ; Armstrong, C.M.

Author_Institution

Omega-P Inc., New Haven, CT, USA

Volume

42

Issue

2

fYear

1995

fDate

2/1/1995 12:00:00 AM

Firstpage

348

Lastpage

355

Abstract

A general dispersion relation for slow wave cyclotron traveling wave interaction in a folded waveguide is derived from a fluid dynamical treatment. The serpentine structure is formed by folding a double-ridged rectangular waveguide so that the orientation of the magnetic field changes (H-plane bend) instead of the conventional E-plane bend configuration. The H-plane bend structure has the potential for the production of high power, broad band radiation. For a cold beam, the linear theory predicts a gain of 2.0-2.5 dB/cm and a bandwidth of 20-25% in the millimeter wave frequencies. The bandwidth is sensitive to the axial velocity spread of the beam. The bandwidth decreases to 10% at δυ_z/υ_z=3%. Means to suppress the backward wave oscillations have to be applied for using the full bandwidth

Keywords

dispersion (wave); dispersion relations; electron beams; gyrotrons; magnetic fields; millimetre wave generation; millimetre wave tubes; ridge waveguides; slow wave structures; H-plane bend; MM-wave tubes; backward wave oscillations suppression; dispersion relation; double-ridged folded waveguide; fluid dynamical treatment; gyro-TWT; high power broadband radiation; linear theory; millimeter wave frequencies; rectangular waveguide; serpentine structure; slow wave cyclotron interaction; traveling wave interaction; Bandwidth; Cyclotrons; Dielectrics; Frequency; Gyrotrons; Magnetic fields; Radiofrequency amplifiers; Rectangular waveguides; Waveguide theory; Waveguide transitions;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.370058

Filename

370058