2008
DOI: 10.1063/1.2993741
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Development of microwave imaging reflectometry in large helical device

Abstract: Three key devices of the microwave imaging reflectometry (MIR) are under development in large helical device (LHD). The 2-D mixer array is developed by stacking the one-dimensional array of the planar Yagi–Uda antenna. The new type of the bandpass filter bank is modified to match the requirement of the MIR. The low-cost quadrature demodulator is also developed for the phase detection system. By using the low-price commercial wireless devices, the development cost becomes much lower than the expensive waveguide… Show more

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Cited by 10 publications
(10 citation statements)
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“…A combined system of MIR and ECEI (electron cyclotron emission imaging) as shown in Fig. 1 has been applied to the Large Helical Device (LHD) [11][12][13]. The MIR system uses 4 different frequency sources in order to obtain the information at 4 radial positions.…”
Section: Microwave/millimeter-wave System With Quasi-optical Transmission Linementioning
confidence: 99%
“…A combined system of MIR and ECEI (electron cyclotron emission imaging) as shown in Fig. 1 has been applied to the Large Helical Device (LHD) [11][12][13]. The MIR system uses 4 different frequency sources in order to obtain the information at 4 radial positions.…”
Section: Microwave/millimeter-wave System With Quasi-optical Transmission Linementioning
confidence: 99%
“…With multiple detectors and multiple operating frequencies, MIR promises to provide a capability for diagnosis of spatially localized density fluctuations comparable to that realized by ECEI for temperature fluctuations. The MIR system on LHD [25][26][27] represents a groundbreaking achievement in 3D imaging of density fluctuations, and provides data key to understanding the transport properties of this stellarator device. At the heart of the LHD MIR system is a horn mixer array (HMA) which combines well-characterized pyramidial horn antennas, Schottky diode mixers, and IF amplification in a single shielded and expandable unit.…”
Section: Recent Advancements In Mirmentioning
confidence: 99%
“…the cutoff layer that may represent density fluctuation [3]. MIR has been intensively developed at the National Institute for Fusion Science (NIFS) for the TPE-RX RFP device [3,4] and for the large helical device (LHD) [5][6][7][8]. In the last MIR experiment at LHD [8], a newly developed horn-antenna millimeter-wave imaging detector (HMID) [9,10] was employed.…”
Section: Introductionmentioning
confidence: 99%