Development of high-frequency, highly stable gyrotrons as Millimeter to submillimeter wave radiation sources

Author

Idehara, Toshitaka ; Mitsudo, Seitaro ; Ogawa, Isamu

Author_Institution

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

Volume

32

Issue

3

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

910

Lastpage

916

Abstract

High-frequency, frequency-tunable, medium-power gyrotrons (Gyrotron FU series) are being developed in Fukui University as millimeter to submillimeter wave sources. The gyrotron series has achieved frequency tuneability in a wide range from 38 to 889 GHz and medium output power from 0.1 kW to several kilowatts in pulse mode (the pulse width is 1 ms and repetition rate 1 Hz) and several tens of watts in CW mode. Stabilizations of both amplitude and frequency have been achieved, for the application to many fields. High purity mode operations by installation of carefully designed cavity were also achieved for highly efficient conversion to Gaussian beam. In this paper, the advances in recent few years are summarized.

Keywords

gyrotrons; millimetre wave oscillators; millimetre wave power amplifiers; submillimetre wave oscillators; 38 to 889 GHz; CW mode; Gaussian beam; frequency tunability; high purity mode operations; high-frequency gyrotrons; millimeter wave radiation sources; pulse mode; submillimeter wave radiation sources; Cathodes; Collaboration; Finite impulse response filter; Fluctuations; Frequency measurement; Gyrotrons; Plasma measurements; Space vector pulse width modulation; Submillimeter wave measurements; Submillimeter wave technology; Gyrotron; millimeter and submillimeter waves;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2004.827599

Filename

1321251