@article{oai:nifs-repository.repo.nii.ac.jp:00010671,
 author = {TOKUZAWA,  Tokihiko and TANAKA,  Kenji and TSUJIMIRA, Toru and TSUJIMURA, Toru Ii and KUBO,  Shin and EMOTO,  Masahiko and INAGAKI,  Shigeru and IDA,  Katsumi and YOSHINUMA,  Mikiro and YOSHINUMA,  Mikirou and WATANABE,  Kiyomasa and TSUCHIYA,  Hayato and EJIRI,  Akira and SAITO,  Teruo and YAMAMOTO, Koji and LHD, Experiment Group},
 journal = {Review of Scientific Instruments},
 month = {Apr},
 note = {0000-0001-5473-2109, A 90 GHz W-band millimeter-wave back-scattering system is designed and installed for measuring electron scale turbulence (k–ρs ∼ 40). A
metal lens relay antenna is used for in-vessel beam focusing, and a beam diameter of less than 40mm is achieved in the plasma core region.
This antenna can be steered at an angle of 159○ ± 6○, which almost covers the plasma radius. The estimated size of the scattering volume is ∼105mm at the edge and 135mm at the core, respectively. A 60m corrugated waveguide is used to achieve a low transmission loss of ∼8 dB. A heterodyne detection system for millimeter-wave circuits with probing power modulation can distinguish the scattered signal from
background noise.},
 title = {W-band millimeter-wave back-scattering system for high wave number turbulence measurements in LHD},
 volume = {92},
 year = {2021}
}