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Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Nagashima, Keisuke; Sukegawa, Kota*; Lu, P.; Takahashi, Kenjiro; Namba, Shinichi; Koike, Masato; et al.
Applied Optics, 42(12), p.2198 - 2205, 2003/04
Times Cited Count：27 Percentile：72.26(Optics)no abstracts in English
Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Sasaki, Akira; Hasegawa, Noboru; Kilpio, A.*; Namba, Shinichi; Nagashima, Keisuke; Lu, P.; Takahashi, Kenjiro; et al.
Physical Review A, 66(3), p.033815_1 - 033815_7, 2002/09
Times Cited Count：85 Percentile：93.03(Optics)A silver and tin slab targets were irradiated by a line-focused CPA glass laser light. In this experiment, the laser pulses consisted of two pulses with 4 ps duration, separated by 1.2 ns. Strong amplification in the nickel-like silver and tin x-ray lasers at the wavelengths of 13.9nm and 12.0nm was demonstrated with a pumping energy of 12 J and 14 J, respectively, and gain-saturation behaviors could be seen. A hydro-dynamics simulation coupled with a collisional-radiative model was performed under the present experimental condition, and the calculated result was compared with the experimental results.
Nakahira, Masataka; Shibanuma, Kiyoshi; Kajiura, Soji*; Shibui, Masanao*; Koizumi, Koichi; Takeda, Nobukazu; Kakudate, Satoshi; Taguchi, Ko*; Oka, Kiyoshi; Obara, Kenjiro; et al.
JAERI-Tech 2002-029, 27 Pages, 2002/03
JAERI-Tech-2002-029.pdf:2.04MB
The ITER vacuum vessel (VV) R&D has progressed with the international collaborative efforts by the Japan, Russia and US Parties during the Engineering Design Activities (EDA). Fabrication and testing of a full-scale VV sector model and a port extension have yielded critical information on the fabrication and assembly technologies of the vacuum vessel, magnitude of welding distortions, dimensional accuracy and achievable tolerances during sector fabrication and field assembly. In particular, the dimensional tolerances of 
3 mm for VV sector fabrication and 10 mm for VV sector field assembly have been achieved and satisfied the requirements of 5 mm and 20 mm, respectively. Also, the basic feasibility of the remote welding robot has been demonstrated. This report presents detailed fabrication and assembly technologies such as welding technology applicable to the thick wall without large distortion, field joint welding technology between sectors and remote welding technology through the VV R&D project.
Kado, Masataka; Kawachi, Tetsuya; Tanaka, Momoko; Hasegawa, Noboru; Takahashi, Kenjiro; Namba, Shinichi; Sukegawa, Kota*; Sasaki, Akira; Lu, P.; Tang, H.; et al.
Soft X-Ray Lasers and Applications IV (Proceedings of SPIE Vol.4505), p.54 - 61, 2001/12
Times Cited Count：4 Percentile：79.48(Optics)no abstracts in English
Obara, Kenjiro; *; Kakudate, Satoshi; Oka, Kiyoshi; Nakahira, Masataka; Morita, Yosuke; *; *; Takeda, Nobukazu; Takahashi, Hiroyuki*; et al.
Fusion Engineering and Design, 42, p.501 - 509, 1998/00
Times Cited Count：3 Percentile：31.85(Nuclear Science & Technology)no abstracts in English
