Study of rotating modes in high frequency whispering gallery mode gyrotrons

Author

Blank, M. ; Kreischer, K.E. ; Temkin, R.J.

Author_Institution

Plasma Fusion Center, MIT, Cambridge, MA, USA

Volume

22

Issue

5

fYear

1994

fDate

10/1/1994 12:00:00 AM

Firstpage

883

Lastpage

888

Abstract

An investigation of coupling to the two rotations of TE_m,2,1 modes of a gyrotron oscillator was made. Experiments were performed on a megawatt power level, 3 μs pulsed gyrotron operating at frequencies from 123.5 GHz (TE_13,2,1) to 153.5 GHz (TE_17,2,1). Single rotation operation was observed with the electron beam centered in the cavity. The influence of tube misalignment on rotation mix was studied. The experimental results were in good agreement with predictions of linear coupling theory for an off axis electron beam. Both experiment and theory showed that significant misalignments of the beam are possible before a switch in the rotation direction of the output mode occurs

Keywords

gyrotrons; millimetre wave oscillators; 123.5 to 153.5 GHz; TE_m,2,1 modes; electron beam; gyrotron oscillator; high frequency whispering gallery mode gyrotrons; linear coupling theory; megawatt power level; pulsed gyrotron; rotating modes; rotation mix; single rotation operation; tube misalignment; Electron beams; Frequency; Gyrotrons; Optical coupling; Oscillators; Plasma measurements; Switches; Tellurium; Waveguide components; Whispering gallery modes;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.338304

Filename

338304