Plasma and Fusion Research

Volume 10, 3402034 (2015)

Regular Articles

Development of a Multi-Channel Horn Mixer Array for Microwave Imaging Plasma Diagnostics
Naoki ITO, Daisuke KUWAHARA1), Yoshio NAGAYAMA2), Masayuki YOSHIKAWA3), Junko KOHAGURA3), Shoji SUGITO4), Atsushi MASE5), Yuichiro KOGI6), Tomokazu YOSHINAGA7) and Soichiro YAMAGUCHI8)
Ube National College of Technology, Ube, Yamaguchi 755-8555, Japan
Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
Kyusyu University, Kasuga, Fukuoka 816-8580, Japan
Fukuoka Institute of Technology, Fukuoka, Fukuoka 811-0295, Japan
National Defense Academy, Yokosuka, Kanagawa 239-0811, Japan
Kansai University, Suita, Osaka 564-8680, Japan
(Received 25 November 2014 / Accepted 24 February 2015 / Published 16 April 2015)


Microwave to millimeter-wave diagnostics techniques, such as interferometry, reflectometry, scattering, and radiometry, have been powerful tools for diagnosing magnetically confined plasmas. The resultant measurements have clarified several physics issues, including instability, wave phenomena, and fluctuation-induced transport. Electron cyclotron emission imaging has been an important tool in the investigation of temperature fluctuations, while reflectometry has been employed to measure plasma density profiles and their fluctuations. We have developed a horn-antenna mixer array (HMA), a 50 - 110 GHz 1D antenna array, which can be easily stacked as a 2D array. This article describes an upgrade to the horn mixer array that combines well-characterized mixers, waveguide-to-microstrip line transitions, intermediate frequency amplifiers, and internal local oscillator modules using a monolithic microwave integrated circuit technology to improve system performance. We also report on the use of a multi-channel HMA system.


plasma diagnostics, electron cyclotron emission imaging, microwave imaging reflectometry, millimeter-wave, mixer array, microwave monolithic integrated circuit

DOI: 10.1585/pfr.10.3402034


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This paper may be cited as follows:

Naoki ITO, Daisuke KUWAHARA, Yoshio NAGAYAMA, Masayuki YOSHIKAWA, Junko KOHAGURA, Shoji SUGITO, Atsushi MASE, Yuichiro KOGI, Tomokazu YOSHINAGA and Soichiro YAMAGUCHI, Plasma Fusion Res. 10, 3402034 (2015).