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

Tokihiko TOKUZAWA; Shigeru INAGAKI; Akira EJIRI; Ryota SOGA; Ichihiro YAMADA; Shin KUBO; Mikiro YOSHINUMA; Katsumi IDA; Chihiro SUZUKI; Kenji TANAKA; Tsuyoshi AKIYAMA; Naohiro KASUYA; Kimitaka ITOH; Kiyomasa WATANABE; Hiroshi YAMADA; Kazuo KAWAHATA; LHD Experiment Group

doi:10.1585/pfr.9.1402149

Regular Articles

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

Tokihiko TOKUZAWA, Shigeru INAGAKI, Akira EJIRI, Ryota SOGA, Ichihiro YAMADA, Shin KUBO, Mikiro YOSHINUMA, Katsumi IDA, Chihiro SUZUKI, Kenji TANAKA, Tsuyoshi AKIYAMA, Naohiro KASUYA, Kimitaka ITOH, Kiyomasa WATANABE, Hiroshi YAMADA, Kazuo KAWAHATA, LHD Experiment Group

Author information

Keywords: Doppler reflectometer, frequency comb, microwave, density fluctuation, poloidal velocity

JOURNAL FREE ACCESS

2014 Volume 9 Pages 1402149

DOI https://doi.org/10.1585/pfr.9.1402149

Details

Abstract

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.

Corresponding author

Register with J-STAGE for free!