Title :
Broadband radiometer system with fast frequency switching synthesizer for electron cyclotron emission measurements in LHD
Author :
Idei, Hiroshi ; Inagaki, Shigeru ; Kawasaki, Shohji ; Zushi, Hideki ; Nagayama, Yoshio ; Kawahata, Kazuo ; Shimozuma, Takashi ; Wataya, Yuichi
Author_Institution :
Kyushu Univ., Fukuoka
Abstract :
The broadband fast frequency-switching heterodyne radiometers have been developed to measure simultaneously three-band components of electron cyclotron emission with high time and frequency resolutions in the large helical device (LHD). The fast frequency-switching system was prepared as a local oscillator part of the heterodyne radiometers. The frequency switching time was 10 mus. The fundamental electron cyclotron emission spectrum was successfully measured using the radiometer in the LHD experiment.
Keywords :
cyclotron radiation; electron emission; radiometers; LHD; broadband radiometer system; electron cyclotron emission measurements; electron cyclotron emission spectrum; fast frequency switching synthesizer; frequency-switching heterodyne radiometers; large helical device; local oscillator; Amplitude modulation; Cyclotrons; Electron emission; Frequency measurement; Frequency synthesizers; Local oscillators; Microwave radiometry; Plasma measurements; Plasma temperature; Power harmonic filters;
Conference_Titel :
Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on
Conference_Location :
Cardiff
Print_ISBN :
978-1-4244-1438-3
DOI :
10.1109/ICIMW.2007.4516545
