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JAEA Reports

Japan - IAEA Joint Nuclear Energy Management School 2016

Yamaguchi, Mika; Hidaka, Akihide; Ikuta, Yuko; Murakami, Kenta*; Tomita, Akira*; Hirose, Hiroya*; Watanebe, Masanori*; Ueda, Kinichi*; Namaizawa, Ken*; Onose, Takatoshi*; et al.

JAEA-Review 2017-002, 60 Pages, 2017/03

JAEA-Review-2017-002.pdf:9.41MB

Since 2010, IAEA has held the NEM School to develop future leaders who plan and manage nuclear energy utilization in their county. Since 2012, JAEA together with Japan Nuclear HRD Network, University of Tokyo, Japan Atomic Industrial Forum and JAIF International Cooperation Center have cohosted the school in Japan in cooperation with IAEA. Since then, the school has been held in Japan every year. In 2006, Japanese nuclear technology and experience, such as lessons learned from the Fukushima Daiichi Nuclear Power Plant accident, were provided to offer a unique opportunity for the participants to learn about particular cases in Japan. Through the school, we contributed to the internationalization of Japanese young nuclear professionals, development of nuclear human resource of other countries including nuclear newcomers, and enhanced cooperative relationship with IAEA. Additionally, collaborative relationship within the network was strengthened by organizing the school in Japan.

Journal Articles

Observation of the laser-induced surface dynamics using the single-shot soft X-ray laser probe

Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Kaihori, Takeshi; Morita, Toshimasa; Sasaki, Akira; Terakawa, Kota*; et al.

X-Ray Lasers 2012; Springer Proceedings in Physics, Vol.147, p.117 - 120, 2014/00

 Times Cited Count:0 Percentile:100

We have developed the femto-second laser pump and soft X-ray laser probe system in order to observe the dynamical processes of the femto-second laser ablation. By using this system, we succeed to obtain the temporal evolution of the soft X-ray reflectivity from the laser induced Pt surface. The results lead that the rate of decrease in the reflectivity of the probe beam has a non-linear relation with the pump laser fluence.

Journal Articles

Development of the X-ray interferometer and the method of spatial and temporal synchronization of XRL and optical pulse

Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Terakawa, Kota*; Tomita, Takuro*; Yamamoto, Minoru; Nishikino, Masaharu; Oba, Toshiyuki; Kaihori, Takeshi; Imazono, Takashi; et al.

X-Ray Lasers 2010; Springer Proceedings in Physics, Vol.136, p.353 - 358, 2011/12

The understanding of the dynamics of the initial process is important for the micro processing and welding by the ultra-short laser pulse. The X-ray laser is suitable for probing this initial process because it has short wavelength (Ni-like Ag, 13.9 nm) and short duration (7 ps). For this investigation, the origin of time of the pumping pulse is quite important. In this study, we used the scintillation plate and the plasma gate technique to realize the spatial and temporal synchronization of the pump and probe pulses. For the spatial alignment, a CsI scintillation plate that was set at the sample position was illuminated by both the X-ray laser pulse, and the fluorescence light were detected by the CCD camera. For the temporal synchronization, we set a thin foil at the sample position. We measured the transmission of the X-ray laser while changing a temporal delay of the pumping laser with respect to the time of X-ray laser pulse to obtain the origin of the irradiation time.

Journal Articles

Observation of the laser-induced surface dynamics by the single-shot X-ray laser interferometer

Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Kaihori, Takeshi; Sasaki, Akira; Terakawa, Kota*; Minami, Yasuo*; et al.

Proceedings of SPIE, Vol.8140, p.81400G_1 - 81400G_8, 2011/10

 Times Cited Count:3 Percentile:14.13

We have developed a soft X-ray laser (SXRL) interferometer capable of the single-shot imaging of nano-scaled structure dynamics. The interferometer consisted of the reflection optics including double Lloyd's mirrors and focusing optics, and the interference fringes are produced on the detector surface. By using this interferometer, the initial stage ($$sim$$50 ps) of the ablation process of the Pt surface pumped by a 70 fs Ti:Sapphire laser pulse was observed. The expansion speed of the surface estimated from the result (34 nm/50 ps) indicated that the nano-bubble structures were formed in the initial stage of the ablation. In order to observe the detailed dynamics, the temporal synchronization between the pump and probe pulses was improved to be 3 ps by adopting a portion of the SXRL and pump beams as the time fiducials, to which the pump and probe timing was adjusted by using the X-ray streak camera.

Journal Articles

Discovery of proteinaceous N-modification in lysine biosynthesis of ${it Thermus thermophilus}$

Horie, Akira*; Tomita, Takeo*; Saiki, Asako*; Kono, Hidetoshi; Taka, Hikari*; Mineki, Reiko*; Fujimura, Tsutomu*; Nishiyama, Chiharu*; Kuzuyama, Tomohisa*; Nishiyama, Makoto*

Nature Chemical Biology, 5(9), p.673 - 679, 2009/09

 Times Cited Count:33 Percentile:35.45(Biochemistry & Molecular Biology)

JAEA Reports

JOYO MK-III Heat Transport System Renovation Operation; Primary Heat Transport Mechanical System (IHXs (Intermediate Heat Exchangers))

Oshima, Jun; Ashida, Takashi; Isozaki, Kazunori; Sumino, Kozo; Yamaguchi, Akira; Sakaba, Hideo; Ozawa, kenji; Tomita, Naoki

JNC-TN9410 2004-011, 279 Pages, 2004/04

JNC-TN9410-2004-011.pdf:68.76MB

The MK-III project to improve the irradiation capability of the experimental fast reactor JOYO have been carried out since 1987.The increase of fast neutron flux and the enlargement of irradiation field increase the reactor thermal power from 100MWt to 140MWt. To accommodate the increased thermal power,the IHXs and the IHX connecting piping were replaced. The IHXs were replaced with securing cooling system boundary in high dose rate surroundings and very limited operation space of the radiation controlled area in the containment vessel. Primary sodium contains radioactive 22Na,24Na and radioactive CPs such as 60Co and 54Mn,and this sodium adhered to the inner surface of IHXs and pipe. Therefore, the renovation procedure and method were carefully examined based on the JOYO operation and maintenance experiences and research and development results on the sodium handling technique.The major results obtained in the primary heat transport mechanical system (IHXs) renovation operation were shown as follows;

Journal Articles

Swelling behavior of TIG-welded F82H IEA heat

Sawai, Tomotsugu; Wakai, Eiichi; Tomita, Takeshi; Naito, Akira; Jitsukawa, Shiro

Journal of Nuclear Materials, 307-311(Part1), p.312 - 316, 2002/12

 Times Cited Count:18 Percentile:24.43(Materials Science, Multidisciplinary)

TIG-weld joints of the IEA heat of F82H were irradiated by TIARA. Transmission electron microscope (TEM) specimens were prepared by a focused ion beam (FIB) system. TEM specimens were obtained from the heat affected zone (HAZ) and the weld metal. HAZ specimens had typical bi-modal cavity microstructure after 50 dpa at 450$$^{circ}$$C with He/dpa ratio of 10 appmHe/dpa. Larger voids about 30 nm were observed in the tempered side specimen, while the size of voids in the quenched side specimen was less than 15 nm. Ac1 temperature determined by heat-treated base metal is 820$$^{circ}$$C. Cavity growth in specimens tempered at higher temperature was enhanced, while that in cold worked ones is suppressed.

Journal Articles

Prescission and postscission charged particle emissions from the $$^{19}$$F+$$^{159}$$Tb reaction

Ikezoe, Hiroshi; Nagame, Yuichiro; *; Sugiyama, Yasuharu; Tomita, Yoshiaki; Ideno, K.; Hamada, S.; ; Iwamoto, Akira; *

Physical Review C, 49(2), p.968 - 976, 1994/02

 Times Cited Count:21 Percentile:22.24(Physics, Nuclear)

no abstracts in English

Journal Articles

Charged particle multiplicities in heavy-ion-induced fission

Ikezoe, Hiroshi; Shikazono, Naomoto; Nagame, Yuichiro; Sugiyama, Yasuharu; Tomita, Yoshiaki; Ideno, K.; *; B.J.Qi*; H.J.Kim*; Iwamoto, Akira; et al.

Physical Review C, 46(5), p.1922 - 1933, 1992/11

 Times Cited Count:41 Percentile:10.83(Physics, Nuclear)

no abstracts in English

Journal Articles

Adiabatic approximation in multi-dimensional penetration problem

Iwamoto, Akira; Tomita, Yoshiaki

Progress of Theoretical Physics, 87(5), p.1171 - 1184, 1992/05

no abstracts in English

Journal Articles

Charged particle emissions in fission process

Ikezoe, Hiroshi; Shikazono, Naomoto; Nagame, Yuichiro; Otsuki, Tsutomu*; Sugiyama, Yasuharu; Tomita, Yoshiaki; Ideno, K.; Kanno, Ikuo; H.J.Kim*; B.J.Qi*; et al.

Nuclear Physics A, 538, p.299C - 306C, 1992/00

no abstracts in English

Journal Articles

Pre-scission $$^{1}$$H and $$^{4}$$He emissions in $$^{16}$$O + $$^{197}$$Au reaction

Ikezoe, Hiroshi; Shikazono, Naomoto; Nagame, Yuichiro; Sugiyama, Yasuharu; Tomita, Yoshiaki; Ideno, K.; Iwamoto, Akira; Otsuki, Tsutomu*

Physical Review C, 42(4), p.1187 - 1190, 1990/10

 Times Cited Count:16 Percentile:35.74(Physics, Nuclear)

no abstracts in English

Journal Articles

Pre-scission $$^{4}$$He multiplicity in the $$^{19}$$F + $$^{197}$$Au reaction

Ikezoe, Hiroshi; Shikazono, Naomoto; Nagame, Yuichiro; Sugiyama, Yasuharu; Tomita, Yoshiaki; Ideno, K.; Iwamoto, Akira; *

Physical Review C, 42(1), p.342 - 353, 1990/07

 Times Cited Count:33 Percentile:13.85(Physics, Nuclear)

no abstracts in English

Journal Articles

Degradation behaviour of fiber reinforced plastic under electron beam irradiation

Sonoda, Katsumi*; Yamamoto, Yasushi*; Hashimoto, Osamu*; Ono, Toshio*; Tomita, Haruhiko*; Udagawa, Akira; Egusa, Shigenori; Sasuga, Tsuneo; Seguchi, Tadao; Tamura, Naoyuki

Japanese Journal of Applied Physics, Part 1, 28(10), p.1950 - 1956, 1989/10

 Times Cited Count:0 Percentile:100(Physics, Applied)

no abstracts in English

Oral presentation

Development of 0.1-Hz double-target X-ray laser and its application

Ochi, Yoshihiro; Hasegawa, Noboru; Kawachi, Tetsuya; Terakawa, Kota*; Suemoto, Toru*; Tomita, Takuro*; Yamamoto, Minoru*; Deki, Manato*; Tanaka, Momoko; Nishikino, Masaharu; et al.

no journal, , 

We have developed a chirped pulse amplification laser with zigzag slab Nd:glass power amplifiers which provides two synchronized beams with energy of $$sim$$10 J and duration of a few ps at 0.1-Hz repetition-rate. Using this laser as a driver, fully spatial coherent X-ray laser at a wavelength of 13.9 nm is generated at 0.1 Hz. Typical energy, beam divergence and duration of the X-ray laser are $$sim$$1 $$mu$$J, 0.5 mrad and 7 ps, respectively. Hence, a quite high peak brilliance is achieved. Using this X-ray laser, various application researches have been started.

Oral presentation

Development of high-rep soft-X-ray laser and its application on solid state physics

Ochi, Yoshihiro; Kawachi, Tetsuya; Hasegawa, Noboru; Terakawa, Kota*; Suemoto, Toru; Tomita, Takuro*; Yamamoto, Minoru*; Deki, Manato*; Tanaka, Momoko; Nishikino, Masaharu; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of high-repetition soft-X-ray laser and its application in solid state physics

Ochi, Yoshihiro; Kawachi, Tetsuya; Hasegawa, Noboru; Nishikino, Masaharu; Tanaka, Momoko; Oba, Toshiyuki; Kishimoto, Maki; Ishino, Masahiko; Imazono, Takashi; Kaihori, Takeshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Development and applications of plasma X-ray lasers

Nishikino, Masaharu; Ochi, Yoshihiro; Hasegawa, Noboru; Kawachi, Tetsuya; Ishino, Masahiko; Imazono, Takashi; Tanaka, Momoko; Sato, Katsutoshi; Yamamoto, Minoru; Oba, Toshiyuki; et al.

no journal, , 

Recent Progress in the development of laser-driven plasma soft X-ray laser (XRL) and the applications are presented. In the source development, TOPAZ laser using Nd:glass zigzag slab amplifiers with 10 J, 0.1 Hz repetition-rate routinely provides the fully spatial coherent X-ray laser at 13.9 nm for the applications. The bright, coherent, and picoseconds X-ray pulse can be used in a variety of applications such as X-ray speckle measurement and interferometer for probing materials, diffraction imaging, nano-scale fabrication, radiation biology, and so on. In order to extend the use of XRLs, now we are constructing new XRL beam lines for the optical pump and XRL probe experiment.

Oral presentation

Applications using X-ray lasers and laser plasma X-ray

Nishikino, Masaharu; Hasegawa, Noboru; Ishino, Masahiko; Ochi, Yoshihiro; Kawachi, Tetsuya; Imazono, Takashi; Yamamoto, Minoru; Sasaki, Akira; Kaihori, Takeshi; Yamagiwa, Mitsuru; et al.

no journal, , 

no abstracts in English

Oral presentation

Observation of the laser-induced surface dynamics using the single-shot soft X-ray laser probe

Hasegawa, Noboru; Nishikino, Masaharu; Ochi, Yoshihiro; Kaihori, Takeshi; Ishino, Masahiko; Imazono, Takashi; Sasaki, Akira; Yamagiwa, Mitsuru; Kawachi, Tetsuya; Suemoto, Toru; et al.

no journal, , 

We have developed a soft X-ray laser (SXRL) interferometer capable of the single-shot imaging of nano-scaled structure dynamics. The depth and lateral resolutions of the interferometer were about 1 nm and 1.8 micron, respectively. By using this interferometer, the initial stage (50 ps) of the ablation process of the Pt surface pumped by a 70 fs Ti:Sapphire laser pulse was observed. In order to observe the detailed dynamics, the temporal synchronization between the pump and probe pulses was improved to be 3 ps by adopting a portion of the SXRL and pump beams as the time fiducials, to which the pump and probe timing was adjusted by using the X-ray streak camera.

23 (Records 1-20 displayed on this page)