Simultaneous projection and detection system of four different frequencies for microwave imaging reflectometry in Large Helical Device | Zendy

T. Yoshinaga | Zendy; Y. Nagayama | Zendy; Daisuke Kuwahara | Zendy; H. Tsuchiya | Zendy; Soichiro Yamaguchi | Zendy; Y. Kogi | Zendy; S. Tsuji-Iio | Zendy; A. Mase | Zendy

Open Access

Simultaneous projection and detection system of four different frequencies for microwave imaging reflectometry in Large Helical Device

Author(s) -

T. Yoshinaga,

Y. Nagayama,

Daisuke Kuwahara,

H. Tsuchiya,

Soichiro Yamaguchi,

Y. Kogi,

S. Tsuji-Iio,

A. Mase

Publication year - 2010

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.3491197

Subject(s) - reflectometry , microwave , superheterodyne receiver , large helical device , optics , microwave imaging , physics , amplitude , antenna (radio) , plasma diagnostics , plasma , telecommunications , quantum mechanics , computer science , computer vision , time domain

A simultaneous projection/detection system of four different frequencies for microwave imaging reflectometry (MIR) was developed for three-dimensional observation of electron density fluctuations in the Large Helical Device (LHD). The microwave with four frequency components at 60.410, 61.808, 63.008, and 64.610 GHz is projected in a continuous-wave mode to illuminate the target LHD plasma. A two-dimensional horn-antenna mixer array (2D HMA) receives the reflected wave from the plasma as well as the wave from the local oscillator operating at 55.800 GHz. The first intermediate frequency (IF) signals at 4.610, 6.008, 7.208, and 8.810 GHz were confirmed to be obtained by downconversion of these microwaves using the 2D HMA. Each of these first IF components is filtered from each other and downconverted again for the superheterodyne detection. It was confirmed that both the amplitudes and the phases of the detected signals reflect the fluctuations in LHD plasmas

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