High quality operation of high frequency gyrotron

Author

Ogawa, I. ; Idehara, T. ; Iwata, Y. ; Pavlichenko, R. ; Mitsudo, S. ; Wagner, D. ; Thumm, M.

Author_Institution

Res. Center for Dev. of Far-Infrared Region, Fukui Univ., Japan

fYear

2002

fDate

26-26 Sept. 2002

Firstpage

293

Lastpage

294

Abstract

High frequency, medium power gyrotrons (Gyrotron FU series) have been developed at Fukui University as radiation sources covering a broad frequency band from millimeter to submillimeter wave region. Conversion from the gyrotron output of circular waveguide mode into a Gaussian-like beam is useful for applications of the gyrotron to a wide field. A high mode purity output is necessary for an effective conversion. In order to improve mode purity, a nonlinear cavity which is designed using a scattering matrix code and fabricated, is installed in the Gyrotron FU VA. The measurement of radiation patterns confirmed a high purity mode operation.

Keywords

S-matrix theory; cavity resonators; gyrotrons; millimetre wave tubes; submillimetre wave tubes; FU series; Gaussian-like beam; broad frequency band coverage; circular waveguide mode; high frequency gyrotrons; high purity mode operation; high quality operation; medium power gyrotrons; millimeter region; mode conversion; nonlinear cavity; radiation patterns; scattering matrix code; submillimeter wave region; Electromagnetic measurements; Electromagnetic scattering; Extraterrestrial measurements; Frequency; Gyrotrons; Plasma diagnostics; Plasma measurements; Plasma sources; Plasma waves; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on

Conference_Location

San Diego, CA, USA

Print_ISBN

0-7803-7423-1

Type

conf

DOI

10.1109/ICIMW.2002.1076200

Filename

1076200