@article{oai:nifs-repository.repo.nii.ac.jp:00011239,
 author = {TOKUZAWA,  Tokihiko and INAGAKI,  Shigeru and INOMOTO, Michiaki and EJIRI,  Akira and NASU, Tatsuhiro and TSUJIMURA, Ii Toru and IDA,  Katsumi},
 issue = {9},
 journal = {Applied Sciences},
 month = {May},
 note = {0000-0001-5473-2109, A new Doppler radar using millimeter-waves in the Ka-band, named the “dual-comb Doppler reflectometer”, has been developed to measure the turbulence intensity and its velocity in high-temperature plasmas. For the realization of a fusion power generation, it is very important to know the spatial structure of turbulence, which is the cause of plasma confinement degradation. As a non-invasive and high spatial resolution measurement method for this purpose, we apply a multi-frequency Doppler radar especially with simultaneous multi-point measurement using a frequency comb. The newly developed method of synchronizing two frequency combs allows a lower intermediate frequency (IF) than the previously developed frequency comb radar, lowering the bandwidth of the data acquisition system and enabling low-cost, long-duration plasma measurements. In the current dual-comb radar system, IF bandwidth is less than 0.5 GHz; it used to be 8 GHz for the entire Ka-band probing. We applied this system to the high-temperature plasma experimental device, the Large Helical Device (LHD), and, to demonstrate this system, verified that it shows time variation similar to that of the existing Doppler radar measurements.},
 title = {Application of Dual Frequency Comb Method as an Approach to Improve the Performance of Multi-Frequency Simultaneous Radiation Doppler Radar for High Temperature Plasma Diagnostics},
 volume = {12},
 year = {2022}
}