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Teshigawara, Makoto; Ikeda, Yujiro; Oi, Motoki; Harada, Masahide; Takada, Hiroshi; Kakishiro, Masanori*; Noguchi, Gaku*; Shimada, Tsubasa*; Seita, Kyoichi*; Murashima, Daisuke*; et al.
Nuclear Materials and Energy (Internet), 14, p.14 - 21, 2018/01
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)We developed an Au-In-Cd (AuIC) decoupler material to reduce induced radioactivity instead of Ag-In-Cd one, which has a cut off energy of 1eV. In order to implement it into an actual moderator-reflector assembly, a number of critical engineering issues need to be resolved with regard to large-sized bonding between AuIC and A5083 alloys by the hot isostatic pressing process. We investigated this process in terms of the surface conditions, sizes, and heat capacities of large AuIC alloys. We also show a successful implementation of an AuIC decoupler into a reflector assembly, resulting in a remarkable reduction of radioactivity by AuIC compared to AIC without sacrificing neutronic performance.
Yamagiwa, Mitsuru; Bulanov, S. V.*; Esirkepov, T. Z.*; Koga, J. K.; Kando, Masaki; Ueshima, Yutaka; Saito, Kanji; Wakabayashi, Daisuke*
Laser Physics, 16(2), p.252 - 258, 2006/02
Times Cited Count：2 Percentile：13.03(Optics)no abstracts in English
Kansai Research Establishment
JAERI-Conf 2005-004, 243 Pages, 2005/06
JAERI-Conf-2005-004.pdf:16.74MB
This report consists of 55 contributed papers of the 6th Symposium on Advanced Photon Research, which was held at JAERI-Kansai in Kyoto on November 4-5, 2004. The numbers of speeches were 16, including 5 invited speeches and the numbers of poster presentations were 56, including the report of presentations and cooperative research and joint research performed in FY2003.
Yokoyama, Keiichi; Teranishi, Yoshiaki; Toya, Yukio; Shirai, Toshizo; Fukuda, Yuji; Aoyama, Makoto; Akahane, Yutaka; Inoue, Norihiro*; Ueda, Hideki; Yamakawa, Koichi; et al.
Journal of Chemical Physics, 120(20), p.9446 - 9449, 2004/05
Times Cited Count：6 Percentile：18.74(Chemistry, Physical)Optimal laser control for ultrafast selection of closely-lying excited states, whose energy separation is smaller than the laser bandwidth, is reported on the two-photon transition of atomic cesium; Cs(6S 
7D
, J = 5/2 and 3/2). Selective excitation was carried out by pulse shaping of ultrashort laser pulses which were adaptively modulated in a closed-loop learning system handling eight parameters representing the electric field. Two-color fluorescence from the respective excited states was monitored to measure the selectivity. The fitness used in the learning algorithm was evaluated from the ratio of the fluorescence yield. After fifty generations, a pair of nearly transform-limitted pulses were obtained as an optimal pulse shape, proving the effectiveness of "Ramsey fringes" mechanism. The contrast of the selection ratio was improved by 
30 % from the simple "Ramsey fringes" experiment.
Hajima, Ryoichi; Nagai, Ryoji
Physical Review Letters, 91(2), p.024801_1 - 024801_4, 2003/07
Times Cited Count：39 Percentile：81.74(Physics, Multidisciplinary)We study the generation of a self-chirped optical pulse in an FEL oscillator. In a high-gain FEL oscillator, frequency chirp is induced in the slippage region as a result of superradiant FEL resonance, and this time-frequency correlation evolves continuously into a few-cycle regime, if the optical cavity length is perfectly synchronized to the electron bunch interval. Numerical simulations based on slowly-evolving-wave-approximation (SEWA) and experimental results are presented.
Minehara, Eisuke
Nuclear Instruments and Methods in Physics Research A, 483(1-2), p.8 - 13, 2002/05
Times Cited Count：21 Percentile：77.32(Instruments & Instrumentation)In order to realize a tunable, highly-efficient, high average power, high peak power and ultra-short pulse free-electron laser(FEL) as a supertool [1]of the 21st for all , the JAERI FEL group and I have developed an industrial FEL driven by a compact, stand-alone and zero-boil-off super-conducting rf linac[2] with an energy-recovery geometry as a conceptual design. Our discussions on the supertool will cover market-requirements for the industrial FELs, some answers from the JAERI compact, stand-alone and zero-boil-off cryostat concept and operational experience over these 8 years, our discovery of the new, highly-efficient, high-power, and ultra-short pulse lasing mode[3], and the energy-recovery geometry.
Minehara, Eisuke; Hajima, Ryoichi; Sawamura, Masaru; Nagai, Ryoji; Nishimori, Nobuyuki; Kikuzawa, Nobuhiro; Sugimoto, Masayoshi; Yamauchi, Toshihiko; Hayakawa, Takehito; Shizuma, Toshiyuki
Proceedings of 13th Symposium on Accelerator Science and Technology, p.150 - 154, 2001/10
We need a powerful and efficient free-electron laser(FEL) for industrial uses, for examples, pharmacy, medical, defense, shipbuilding, semiconductor industry, chemical industries, environmental sciences, space-debris, power beaming and so on. In order to realize such a tunable, highly-efficient, high average power, high peak power and ultra-short pulse FEL, the JAERI FEL group and I have successfully demonstrated the efficient and powerful FEL driven by a compact, stand-alone and zero-boil-off super-conducting rf linac with an energy-recovery geometry. Our discussions on the FEL will cover market-requirements for the industrial FELs, some answers from the JAERI compact, stand-alone and zero-boil-off cryostat concept and operational experience over these 8 years, our discovery of the new, highly-efficient, high-power, and ultra-short pulse lasing mode, and the energy-recovery geometry.
Utsumi, Takayuki*; Sasaki, Akira; Fujii, Sadao*
Keisan Kogaku Koenkai Rombunshu, 5, 4 Pages, 2000/05
no abstracts in English
Utsumi, Takayuki*; Sasaki, Akira; Kunugi, Tomoaki*; Fujii, Sadao*; Akamatsu, Mikio*
Proceedings of 13th International Conference on High-Power Particle Beams (BEAMS 2000) (CD-ROM), 4 Pages, 2000/00
no abstracts in English
Yamagiwa, Mitsuru; Koga, J. K.; L.N.Tsintsadze*; Ueshima, Yutaka*; Kishimoto, Yasuaki
Physical Review E, 60(5), p.5987 - 5990, 1999/11
Times Cited Count：19 Percentile：62.94(Physics, Fluids & Plasmas)no abstracts in English
*; Sasaki, Akira; Kunugi, Tomoaki*; *; *
Computational Fluid Dynamics Journal, 8(1), p.128 - 134, 1999/04
no abstracts in English
Ueshima, Yutaka*; Arakawa, Takuya*; Kishimoto, Yasuaki; Sasaki, Akira; Tajima, Toshiki*
Inst. Phys. Conf. Ser., (159), p.325 - 328, 1999/00
no abstracts in English
*; Sasaki, Akira; Kunugi, Tomoaki*; *; *
Inst. Phys. Conf. Ser., (159), p.451 - 454, 1999/00
no abstracts in English
Yamagiwa, Mitsuru; Koga, J. K.
Journal of Physics D; Applied Physics, 32(19), p.2526 - 2528, 1999/00
Times Cited Count：22 Percentile：67.86(Physics, Applied)no abstracts in English
*; Kato, Masaaki; Niwa, Yoshito*; Harayama, Sayaka; Maruyama, Yoichiro; Matoba, Toru; Arisawa, Takashi
Optics Letters, 23(7), p.514 - 516, 1998/04
Times Cited Count：19 Percentile：67.71(Optics)no abstracts in English
Kansai Research Establishment
JAERI-Conf 98-004, 189 Pages, 1998/03
no abstracts in English
*; Kato, Masaaki; Niwa, Yoshito*; Harayama, Sayaka; Maruyama, Yoichiro; Matoba, Toru; Arisawa, Takashi
Solid State Lasers VII, 3265, p.212 - 218, 1998/00
no abstracts in English
*; *; Matoba, Toru; Yamamoto, Shin
Reza Kenkyu, 20(6), p.375 - 391, 1992/06
no abstracts in English
; ; *; *
Plasma Physics and Controlled Nuclear Fusion Research 1984, Vol.l, p.665 - 672, 1985/00
no abstracts in English
Kando, Masaki; Pirozhkov, A. S.; Esirkepov, T. Z.; Kotaki, Hideyuki; Mori, Michiaki; Kiriyama, Hiromitsu; Hayashi, Yukio; Koga, J. K.; Bulanov, S. V.
no journal, ,
Wakaida, Ikuo; Oba, Hironori; Akaoka, Katsuaki; Karino, Takahiro; Sakamoto, Kan*; Nakanishi, Ryuzo*; Kashiwakura, Shunsuke*; Taira, Takunori*; Ikeda, Yuji*; Deguchi, Yoshihiro*
no journal, ,
We are developing remote in-situ analysis by laser induced breakdown spectroscopy (LIBS) for simple in-situ screening analysis of fuel debris in the decommissioning of the Fukushima Daiichi Nuclear Power Station. For various application scenarios, microchip laser based LIBS for ultra-long distance analysis, microwave assisted LIBS for signal enhancement, and long/short double pulse laser LIBS for water-containing samples are developing as the fiber-optic LIBS system. To have the reliability, valuation with nuclear fuel materials and spent fuel, and radiation resistance test by 
Co irradiation will be planed. As a challenging trial, a development of Machine learning technique has introduced for automatically analysis of LIBS spectra.
