Ka-band Microwave Frequency Comb Doppler Reflectometer System for the Large Helical Device

A ka-band multi-channel Doppler reflectometer system was constructed for the Large Helical Device (LHD) using a comb frequency generator as a source. A filter bank system is utilized for precise quadrature phase detection, and preliminary back-scattered waves were obtained in LHD plasma experiments. In addition, a direct digital signal acquisition system was successfully demonstrated for providing a greater number of multi-channel measurements. c © 2014 The Japan Society of Plasma Science and Nuclear Fusion Research

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