Title :
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
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;
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
DOI :
10.1109/ICIMW.2002.1076200
