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Sasajima, Tadayuki; Masaki, Kei; Sakurai, Shinji; Shibama, Yusuke; Hayashi, Takao; Suzuki, Yutaka; Takahashi, Ryukichi
Heisei-18-Nendo Nagoya Daigaku Sogo Gijutsu Kenkyukai Sochi Gijutsu Kenkyukai Hokokushu, p.148 - 151, 2007/03
no abstracts in English
Kudo, Yusuke; Sawai, Tomotsugu; Sakurai, Shinji; Masaki, Kei; Suzuki, Yutaka; Sasajima, Tadayuki; Hayashi, Takao; Takahashi, Ryukichi*; Honda, Masao; Jitsukawa, Shiro; et al.
Journal of the Korean Physical Society, 49(96), p.S297 - S301, 2006/12
Installation of ferritic steel tiles was proposed in JT-60U to reduce the toroidal magnetic field ripple and to improve the fast ion loss, which degrades heating efficiency and increases heat load on plasma facing component under large volume plasma operations. We selected a 8Cr-2W-0.2V ferritic steel with the cost-effectiveness, in which concentration limits of activation elements in F82H were relaxed because of the less number of neutron generations from deuterium operations on JT-60U. The fabricated ferritic steel has clear tempered martensitic microstructure, and sufficient magnetic and mechanical properties. The saturated magnetization was estimated to 1.7 Tesla at 573 K, lower than expected, but effectiveness in JT-60U was confirmed by numerical analyses. To research the effect of material conditions, such as microstructure and heat treatment, on saturated magnetization of the ferritic steel based on 8-9Cr is important for the future fusion reactors which will be planned to install the ferritic steel as the in-vessel components.
Takahashi, Yoshikazu; Yoshida, Kiyoshi; Tsuji, Hiroshi; *; *; *; *; *; Takahashi, Ryukichi*; Asano, Katsuhiko*; et al.
Proc. of 16th Int. Cryogenic Engineering Conf. /Int. Cryogenic Materials Conf., 0, p.811 - 814, 1996/00
no abstracts in English
Sakurai, Shinji; Masaki, Kei; Shibama, Yusuke; Shinohara, Koji; Suzuki, Yutaka; Sasajima, Tadayuki; Morioka, Atsuhiko; Hayashi, Takao; Takahashi, Ryukichi; Sawai, Tomotsugu; et al.
no journal, ,
In order to reduce Toroidal magnetic Field (TF) ripple in JT-60U, ferritic steel (8Cr-2W-0.2V) armors were installed inside Vacuum Vessel (VV). 55 plates of 8Cr-2W-0.2V were manufactured from 2.6 ton ingots made by 20 ton vacuum induction melting. Saturated magnetization and thermal conductivity are 10-20% lower than those of F82H. Electrical resistivity and tensile properties are similar to those of F82H. 1122 carbon armors were replaced to 8Cr-2W-0.2V with reinforcement of stud nut. The absorbed beam power will be expected to increase 30%. A correction method of additional magnetic flux and field caused by 8Cr-2W-0.2V armors for magnetic probes is proposed for plasma position and shape control. Correction for flux loops is mostly good, but correcting model and program for B
probe need some improvements.
