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Ochi, Yoshihiro; Hasegawa, Noboru; Suzuki, Yoji; Sukegawa, Kota*; Kawachi, Tetsuya; Kishimoto, Maki; Nagashima, Keisuke
JAERI-Tech 2004-062, 32 Pages, 2004/11
JAERI-Tech-2004-062.pdf:1.84MB
We have designed new chirp-pulse amplification (CPA) laser system for 0.1 Hz repetition rate soft X-ray laser system. We adopted the optical parametric chirped pulse amplifier (OPCPA) for a pre-amplifier because of its pulse controllability. For a main-amplifier, we decided to use a zigzag-slab amplifier because of its thermal radiation ability. In order to avoid the inhomogeneous spatial profile of the amplified laser beam, the image of the incident laser light created by a serrated aperture is transferred by use of an image relay system. In this report, we will show the preliminary test of each amplifier using a prototype system and the details of the final system design.
Idomura, Yasuhiro; Tokuda, Shinji; Kishimoto, Yasuaki
New Journal of Physics (Internet), 4(1), p.101.1 - 101.13, 2002/12
The ion temperature gradient driven (ITG) mode in reversed shear tokamaks is analyzed using a gyrokinetic toroidal particle code. It is found that the ITG mode in the reversed shear configuration shows a coupled mode structure between the slab and toroidal ITG modes. Especially in the 
region, a slab like feature due to the reversed shear slab ITG mode becomes strong. This coupled eigenmode structure is changed from a slab mode to a toroidal mode depending on 
and 
. Results show that in reversed shear tokamaks, the ITG mode is determined from a competition between the slab and toroidal ITG modes.
Oba, Masaki; Maruyama, Yoichiro
JAERI-Research 2001-040, 24 Pages, 2001/08
JAERI-Research-2001-040.pdf:2.35MB
no abstracts in English
Mori, Tomoaki*; Takemura, Morio*
JNC TJ9450 2000-001, 96 Pages, 2000/03
JNC-TJ9450-2000-001.pdf:2.04MB
This report is intended to make it easier to apply the measured data obtained from the Special Materials Experiment, which was conducted at the Oak Ridge National Laboratory (ORNL) during about a month beginning at the end of June, 1992 as the last one of a series of eight experiments planned for the Japanese-American Shielding Program for Experimental Research (JASPER) which was started in 1986. For this reason. the information presented includes specifications and measurement data for all configurations, compositions of all materials, characteristics of the measurement system. and daily-basis records of measurements. The Special Materials Experiment was planned to obtain the data of neutron attenuation characteristics of selected shielding materials for use in advanced fast reactors. The material of particular interest for the experiment was zirconium hydride that is rich in hydrogen. The mockup slabs for the special materials were preceded by the spectrum modifier behind the TSR-II reactor of Tower Shielding Facility. The layer of zirconium hydride was simulated with a combination of zirconium and polyethylene slabs. The thick layer of polyethylene with no zirconium was installed in some configurations.Neutron flux was measured behind the configurations with various types of detectors. The integral neutron flux in wide energy region was measured in eight configurations and neutron spectrum in high energy region was measured also in almost all configurations. Information presented in this report is based mainly on a report issued by ORNL (ORNL/TM-12277. "Measurements for the JASPER Program Special Materials Experiment"). Additional information reported by the assignee is utilized also.
*; Kato, Masaaki; Matsuoka, Fumiaki*; Niwa, Yoshito*; Maruyama, Yoichiro; Matoba, Toru; Arisawa, Takashi
Applied Optics, 38(21), p.4548 - 4551, 1999/07
Times Cited Count：8 Percentile：43.11(Optics)no abstracts in English
*; Tokuda, Shinji; Wakatani, Masahiro*
Purazuma, Kaku Yugo Gakkai-Shi, 75(2), p.131 - 142, 1999/02
no abstracts in English
crystal for the second harmonic generation of high average power zigzag slab Nd:YAG laser*; Kato, Masaaki; Matsuoka, Fumiaki*; Niwa, Yoshito*; Maruyama, Yoichiro; Matoba, Toru; Arisawa, Takashi
Japanese Journal of Applied Physics, Part 2, 38(1A-B), p.L35 - L37, 1999/01
Times Cited Count：6 Percentile：32.51(Physics, Applied)no abstracts in English
Maruyama, Yoichiro; Kato, Masaaki; Oba, Masaki
JAERI-Tech 98-018, 45 Pages, 1998/06
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
Maruyama, Yoichiro
Isotope News, p.2 - 5, 1998/02
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
Maruyama, Yoichiro; *; Kato, Masaaki; Niwa, Yoshito*; Harayama, Sayaka; Oba, Masaki; Matoba, Toru; Arisawa, Takashi
Reza Gakkai Kenkyukai Hokoku, p.25 - 29, 1997/12
no abstracts in English
Yoshizawa, Michio; Yamaguchi, Yasuhiro
IRPA9: 1996 International Congress on Radiation Protection, Proceedings, 3, p.41 - 43, 1996/00
no abstracts in English
*; *; Himeno, Yoshiaki; Haga, Kazuo*; Miyake, Osamu; *; *
PNC TN9410 90-119, 58 Pages, 1990/03
With a view to giving reasonable requirements for design of containment features in a large LMFBR, this study discusses the following issues: selection of representative events considered in the safety design/evaluation, consideration of the effect of sodium on FP retention in the "Hypothetical Accident" (site evaluation accident), and evaluation of safety margin against beyond-design-basis events. This report contains some technical documents which are provided to the study group meeting.
Hirano, Masashi; Asahi, Yoshiro
Journal of Nuclear Science and Technology, 16(4), p.235 - 244, 1979/00
Times Cited Count：0no abstracts in English
*
JAERI-M 7314, 15 Pages, 1977/10
no abstracts in English
