@article{oai:repo.qst.go.jp:00084519,
 author = {Takayuki, Kobayashi and Hibiki, Yamazaki and Shinichi, Hiranai and Masayuki, Sawahata and Masayuki, Terakado and Keito, Ishita and Jun, Hinata and Fumiaki, Sato and Kenji, Wada and Toida, Nobuhiro and Ryosuke, Ikeda and Takahiro, Shinya and Satoru, Yajima and Ken, Kajiwara and Koji, Takahashi and Shinichi, Moriyama and Takayuki, Kobayashi and Hibiki, Yamazaki and Shinichi, Hiranai and Masayuki, Sawahata and Masayuki, Terakado and Keito, Ishita and Jun, Hinata and Fumiaki, Sato and Kenji, Wada and Toida, Nobuhiro and Ryosuke, Ikeda and Takahiro, Shinya and Satoru, Yajima and Ken, Kajiwara and Koji, Takahashi and Shinichi, Moriyama},
 issue = {2},
 journal = {Nuclear Fusion},
 month = {Feb},
 note = {A gyrotron and a matching optics unit (MOU) for the multi-frequency electron cyclotron heating and current drive (ECH/CD) system in JT-60SA have been developed successfully. The gyrotron demonstrated stable operation at high powers of 1.5 MW for 5 s and 1.9 MW for 1 s at 110 GHz. To obtain high HE11 mode purity (> 90%) at the outlet of the waveguide in the ECH/CD launcher, a MOU for operating at three frequencies of 82 GHz, 110 GHz, and 138 GHz that includes three pairs of water-cooled phase correcting mirrors has been developed, which allows the mirrors to be changed without opening the evacuated MOU. The mode purity at the inlet of a dummy load in the transmission line was evaluated at high-power and an HE11 mode purity of > 90% was obtained at three frequencies.},
 pages = {026039-1--026039-8},
 title = {Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA},
 volume = {62},
 year = {2022}
}