Electron beam alternating rotation in periodic permanent magnet focusing field has an effect on parasitic backward-wave oscillation in helix traveling wave tube

Author

Belyavskiy, Eugene D. ; Chasnyk, Vasiliy I. ; Strokovsky, Yaroslav N. ; Khotiaintsev, Sergei N.

Author_Institution

Fac. of Electron., Nat. Tech. Univ. of Ukraine, Kiev, Ukraine

fYear

2004

fDate

11-14 Oct. 2004

Firstpage

139

Lastpage

142

Abstract

We have verified experimentally the theoretical predictions of our previous work (Belyavskiy, E.D. et al., IEEE Trans. Electron Devices, vol.48, no.8, p.1727-36, 2001) about the effect of electron beam alternating rotation on the parasitic backward-wave oscillation in the amplifier-type helix traveling-wave tube (TWT) under periodic permanent magnetic (PPM) focusing. We measured the backward-wave start-oscillation current as a function of the interaction length in a specially designed helix backward wave oscillator. The observed behavior is much closer to the predictions of our theory, than to theories that ignore the electron beam rotation. Our results can be used for improving the stability of the PPM-focused helix TWT with respect to parasitic backward-wave oscillation.

Keywords

backward wave oscillators; electric current; electron beam focusing; stability; travelling wave amplifiers; TWT; alternating electron beam rotation; electron beam alternating rotation; helix backward wave oscillator; helix traveling wave tube; parasitic backward-wave oscillation; periodic permanent magnet focusing field; start-oscillation current; Circuit stability; Current measurement; Electron beams; Electron tubes; Length measurement; Magnetic flux; Magnetic shielding; Magnetosphere; Oscillators; Permanent magnets;

fLanguage

English

Publisher

ieee

Conference_Titel

Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004. Proceedings of the 9th International Seminar/Workshop on

Print_ISBN

966-02-3253-5

Type

conf

DOI

10.1109/DIPED.2004.242809

Filename

1371086