@misc{oai:repo.qst.go.jp:00075835,
 author = {徳沢季彦 and 稲垣滋 and 江尻晶 and 出射浩 and Imazawa, Ryota and Oyama, Naoyuki and Yoshida, Maiko and 田中謙治 and 土屋隼人 and 居田克巳 and Watanabe, K.Y. and Yamada, H. and Imazawa, Ryota and Oyama, Naoyuki and Yoshida, Maiko},
 month = {May},
 note = {New Ka-band frequency comb Doppler reflectometer systems has been installed in LHD. Previous frequency comb system needs a very high sampling rate (40 GS/s) digital storage system to obtain all frequency comb components in the probing beam, and the observable time is limited by the memory size. This time, a dual frequency comb sources with a 20 MHz difference are used to reduce the IF frequency components to less than 2 GHz, leading to lower sampling rate digitizers. In addition, the new receiver circuit requires standard radio frequency range components and a circuit board thanks to the IF reduction. Cost saving and better performance are achieved. Details of new system and some topical results observed in LHD plasma will be presented and the processing technique will be discussed.
Study of the installation of Doppler reflectometer to JT-60SA has been carried. The preliminary results of a full-wave 3D numerical simulation for the feasibility study will be presented., 14th International Reflectometry Workshop},
 title = {Dual-Comb Microwave Doppler Reflectometer System in LHD and Feasibility Study for a JT-60SA Doppler Reflectometer},
 year = {2019}
}