Design and test of launcher and transmission line for JT-60SA ECRF system

JT-60SA電子サイクロトロン波装置用ランチャー及び伝送路の設計と試験

小林 貴之; 諫山 明彦; 鈴木 貞明; 平内 慎一; 和田 健次; 日向 淳; 佐藤 福克; 横倉 賢治; 星野 克道; 森山 伸一

Kobayashi, Takayuki; Isayama, Akihiko; Suzuki, Sadaaki; Hiranai, Shinichi; Wada, Kenji; Hinata, Jun; Sato, Yoshikatsu; Yokokura, Kenji; Hoshino, Katsumichi; Moriyama, Shinichi

JT-60SA電子サイクロトロン波(ECRF)装置の建設に向けて、ランチャー及び伝送路の設計と試験を行っている。既設JT-60用ECRF装置で用いた内径31.75mmの導波管機器について、高出力・長時間伝送時の温度上昇の空間分布を詳細に調べた結果、JT-60SAで要求される1MW, 100秒の伝送を行うには、冷却構造の改善m又は伝送損失の低減が必要であることがわかった。そこで、内径60.3mmの導波管を新規に導入した。初期的な大電力伝送試験を実施した結果、予想外の放電や真空度劣化はなく期待通りの動作が確認できた。一方、ランチャーについては、周辺機器との干渉を避ける改善を行った。また、ミラー駆動用の軸受け部の信頼性を高めるため、固体潤滑剤を用いた改良構造の試験体を製作した。

Design and test of launcher and transmission line for JT-60SA electron cyclotron range of frequency (ECRF) system have been carried out. Spatial profile of temperature rise of 31.75 mm waveguide components, which was used in the previous JT-60, was measured for high-power and long-pulse transmission. It was clarified that improvements of cooling efficiency or change in design is required for achieving 1 MW, 100 s transmission, which is required in JT-60SA. Thus 60.3 mm waveguide components was newly installed. In the preliminary test of the new transmission line, unexpected arcing and increase in vacuum pressure was not observed, and the system worked as expected. As for the launcher, a preliminary layout of the launcher and support was improved in order to keep acceptable distance from systems around the ECRF launcher. Moreover, a mock-up of an improved support structure of the driving shaft using solid lubricants was fabricated in order to improve reliability of the structure.