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Kobayashi, Takayuki; Hiranai, Shinichi; Sawahata, Masayuki; Terakado, Masayuki; Wada, Kenji; Hinata, Jun; Sato, Fumiaki; Yokokura, Kenji; Hoshino, Katsumichi; Takahashi, Koji; et al.
no journal, ,
A mechanical structure of the launcher for electron cyclotron heating and current drive in JT-60SA has been designed to realize wide range of poloidal and toroidal injection angles with high reliability. One of the key components is a bellows structure (vacuum boundary) enabling linear and rotation motions of the rigid shaft. A full scale mock-up of the bellows structure has been fabricated and tested. The linear motion was repeated 100,000 cycles and the rotation motion was repeated 10,000 cycles. In this test, no evidence of vacuum leakage was observed. Then, the mock-up has been extended up to the first mirror including full length of the steering shaft (~4 m) and bearings. The cyclic test of the full system of the driving structure will be carried out in 2015. A mock-up of M2, which is a large curved mirror including four cooling channels, has been designed and fabricated. It was experimentally confirmed that the flow rate of each cooling channels was consistent with the design.
Ikeda, Ryosuke; Oda, Yasuhisa; Kobayashi, Takayuki; Terakado, Masayuki; Kajiwara, Ken; Takahashi, Koji; Moriyama, Shinichi; Sakamoto, Keishi
no journal, ,
Moriyama, Shinichi; Kobayashi, Takayuki; Sawahata, Masayuki; Terakado, Masayuki; Hiranai, Shinichi; Wada, Kenji; Hinata, Jun; Sato, Fumiaki; Yokokura, Kenji; Hoshino, Katsumichi; et al.
no journal, ,
Assembly of the JT-60SA and preparation of its ECH system are progressing and the first plasma is planned in 2019. The high voltage power supply for two gyrotrons will be procured by EU. The procurement arrangement was signed in July 2015. Its fabrication in EU will be done in 2016 and the installation to the Naka-site will be in 2017. Oscillations at 1 MW for 100 s as the development target of the JT-60SA gyrotron were achieved at both 110 GHz and 138 GHz in June 2014. The gyrotron is the first "1 MW multi-frequency gyrotron" reached the pulse duration of 100s at two frequencies. In addition, 82 GHz oscillation was achieved at 1.0 MW for 1 sec by this gyrotron in June 2015. This additional frequency would be applicable to plasma start-up assistance and wall conditioning at the fundamental EC resonance in JT-60SA. Development is steadily progressing on the waveguide components and the launcher.
Oda, Yasuhisa; Ikeda, Ryosuke; Oshima, Katsumi; Hayashi, Kazuo*; Takahashi, Koji; Kajiwara, Ken; Kobayashi, Takayuki; Moriyama, Shinichi; Sakamoto, Keishi; Darbos, C.*; et al.
no journal, ,
Takahashi, Koji; Abe, Ganji; Isozaki, Masami; Kobayashi, Noriyuki*; Shidara, Hiroyuki; Oda, Yasuhisa; Ikeda, Ryosuke; Kobayashi, Takayuki; Moriyama, Shinichi; Sakamoto, Keishi
no journal, ,
An ITER equatorial EC launcher has been designed to inject a 170 GHz, 20 MW millimeter wave beam to plasma with poloidal steering functionality in order to obtain more driven current at the peripheral region of plasma. The millimeter wave design to accomplish the high transmission efficiency more than 99% and to compliant with the requirement on heat load on the mirror s and beam size at the resonance location of plasma has been successfully developed. The mock-up to simulate the millimeter wave propagation in the launcher based on the design modification of the beam path is fabricated and the low power experiment is in progress. The field pattern measurement at the mock-up outlet indicates the validity of the design optimization of mirror's and the waveguide set-up. The design of the millimeter wave beam path for poloidal steering launcher and the experiments of the launcher mock-up are reported in detail at the workshop.