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Moriyama, Shinichi; Kobayashi, Takayuki; Sawahata, Masayuki; Terakado, Masayuki; Hiranai, Shinichi; Wada, Kenji; Sato, Yoshikatsu; Hinata, Jun; Yokokura, Kenji; Hoshino, Katsumichi; et al.
no journal, ,
Long pulse operation of the dual frequency gyrotron was started for JT-60SA ECH system. Pulse length of 2 s at 0.4 MW output, and 1 s at 0.7 MW were obtained at both 110 GHz and 138 GHz, so far. Typical oscillation efficiency is about 30%. Diffraction loss was acceptable for long pulse 1 MW output. The first high power test of the "power and beam profile monitor" featuring a fast movable Si
N
disk in the waveguide slit was successfully demonstrated.
Idei, Hiroshi*; Moriyama, Shinichi; Kobayashi, Takayuki
no journal, ,
The 2 frequency (110/138 GHz) gyrotron has been developed for a JT-60SA ECHCD system. The FADIS for the 2-frequency gyrotron system is developing under a JAEA collaboration with Kyushu University. A square corrugated waveguide diplexer system with 2 resonant rings has been considered for the 2 frequency application. The output beams split fifty-fifty to symmetric and anti-symmetric directions with proper imaging properties larger than 90% efficiencies for the incident Gaussian beam. The design work of the square corrugated waveguide diplexer will be reported.
Kobayashi, Takayuki; Isayama, Akihiko; Hiranai, Shinichi; Sawahata, Masayuki; Terakado, Masayuki; Wada, Kenji; Sato, Yoshikatsu; Hinata, Jun; Yokokura, Kenji; Hoshino, Katsumichi; et al.
no journal, ,
An original design of the toroidal injection angle range of electron cyclotron waves in JT-60SA was -15 degree to +15 degree for effective use of 110 GHz wave. However, the modification of the toroidal angle range has been discussed since the frequency of 138 GHz is considered to be a second frequency by the use of a dual frequency gyrotron. We report newly calculated available steering range of the launcher on both poloidal and toroidal angles with and without tilting angle of the second mirror, which is considered to obtain large toroidal injection angle. Moreover calculated beam divergences for various curvature radiuses of the first and second mirrors are shown. The decision of the target injection angle range for JT-60SA initial plasma will be made by the JT-60SA physics team by taking into account the above calculation results.
Oda, Yasuhisa; Oshima, Katsumi; Ikeda, Ryosuke; Kajiwara, Ken; Takahashi, Koji; Hayashi, Kazuo*; Sakamoto, Keishi; Purohito, D.*; Henderson, M.*
no journal, ,
Sakamoto, Keishi; Kajiwara, Ken; Oda, Yasuhisa; Takahashi, Koji; Hayashi, Kazuo*; Kobayashi, Takayuki; Moriyama, Shinichi
no journal, ,