Developments of Millimeter Wave Backscattering Systems for Fusion Plasma Turbulence Measurements

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For measuring a turbulence in a high-temperature nuclear fusion plasma, two backscattering systems have been developed in the Large Helical Device (LHD). The Ka-band and U-band Doppler backscattering system have been designed for measuring the ion Larmor radius scale turbulence. Because of the turbulence profile measurements, a microwave frequency comb is used as a source. The W -band backscattering system is designed for measuring the electron Larmor radius scale turbulence.

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