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Journal Articles

New method to measure the rise time of a fast pulse slicer for laser ion acceleration research

Mori, Michiaki; Yogo, Akifumi; Kiriyama, Hiromitsu; Nishiuchi, Mamiko; Ogura, Koichi; Orimo, Satoshi; Ma, J.*; Sagisaka, Akito; Kanazawa, Shuhei; Kondo, Shuji; et al.

IEEE Transactions on Plasma Science, 36(4), p.1872 - 1877, 2008/08

 Times Cited Count:7 Percentile:30.94(Physics, Fluids & Plasmas)

A dependence of cut-off proton kinetic energy on laser prepulse duration has been observed. ASE pedestal duration is controlled by a fast electro-optic pulse slicer where the risetime is estimated to be 130 ps. We demonstrate a new correlated spectral technique for determining this risetime using a stretched, frequency chirped pulse.

Journal Articles

Simultaneous proton and X-ray imaging with femtosecond intense laser driven plasma source

Orimo, Satoshi; Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Ogura, Koichi; Sagisaka, Akito; Li, Z.*; Pirozhkov, A. S.; Mori, Michiaki; Kiriyama, Hiromitsu; et al.

Japanese Journal of Applied Physics, Part 1, 46(9A), p.5853 - 5858, 2007/09

 Times Cited Count:16 Percentile:55.33(Physics, Applied)

A laser-driven proton beam with a maximum energy of a few MeV is stably obtained using an ultra-short and high-intensity Titanium Sapphire laser. At the same time, keV X-ray is also generated at almost the same place where protons are emitted. Here, we show the successful demonstration of simultaneous proton and X-ray projection images of a test sample placed close to the source with a resolution of $$sim$$10$$mu$$m, which is determined from the source sizes. Although the experimental configuration is very simple, the simultaneity is better than a few hundreds of ps. A CR-39 track detector and imaging plate, which are placed as close as possible to the CR-39, are used as detectors of protons and X-ray. The technique is applicable to the precise observation of microstructures.

Journal Articles

High-energy, high-contrast, multiterawatt laser pulses by optical parametric chirped-pulse amplification

Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Yamamoto, Yoichi*; Tanoue, Manabu*; Akutsu, Atsushi; Shimomura, Takuya*; Kondo, Shuji; Kanazawa, Shuhei; Daido, Hiroyuki; et al.

Optics Letters, 32(16), p.2315 - 2317, 2007/08

 Times Cited Count:46 Percentile:87.9(Optics)

We describe a compact, reliable, high-power, and high-contrast noncollinear optical parametric chirped-pulse amplifier system. With a broadband Ti:sapphire oscillator and grating-based stretching and compression, the chirped pulses are amplified from 0.1 nJ to 122 mJ in type-I $$beta$$-barium borate optical parametric chirped pulse amplifiers with a total gain of over 10$$^{9}$$ at 10 Hz repetition rate. Pulse compression down to 19-fs duration achieved after amplification indicates a peak power of 3.2 TW at an average power of 0.62 W. The pre-pulse contrast is measured to be less than 10$$^{-8}$$ on picosecond timescales.

Journal Articles

Development of laser driven proton sources and their applications

Daido, Hiroyuki; Sagisaka, Akito; Ogura, Koichi; Orimo, Satoshi; Nishiuchi, Mamiko; Mori, Michiaki; Ma, J.-L.; Pirozhkov, A. S.; Kiriyama, Hiromitsu; Kanazawa, Shuhei; et al.

Proceedings of 7th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2007) (CD-ROM), p.77 - 79, 2007/00

We are developing a proton accelerator using an intense lasers with a focused intensity of $$>$$ 10$$^{17}$$ W/cm$$^{2}$$. To monitor proton energy spectra as well as plasma parameters at each laser shot, we are using real time detectors. The proton energy of MeV is stably obtained for applications.

JAEA Reports

An Investigation of post-irradiation examination facility for fusion blanket materials

Yamada, Hirokazu*; Kawamura, Hiroshi; Tsuchiya, Kunihiko; Ishitsuka, Etsuo; Uchida, Munenori*; Akutsu, Yoichi; Motoki, Ryozo; Watanabe, Wataru; Hirata, Shogo*

JAERI-Tech 2004-036, 138 Pages, 2004/03

JAERI-Tech-2004-036.pdf:4.07MB

This document shows the model case concerned with the utilization of constructed facility for the construction of post irradiation examination facility for fusion blanket. In this report, the radioisotope application and development laboratory is considered as constructed facility for post irradiation examination facility and we planned to improve the radioisotope application and development laboratory to the facility of post irradiation examination for fusion material to reduce the construction fee for this facility and promotion of efficiency by concentration of any equipment for fusion material research.

JAEA Reports

Investigation of water content in primary upper shield of High Temperature Engineering Test Reactor (HTTR)

Sumita, Junya; Sawa, Kazuhiro; Mogi, Haruyoshi; ; Kitami, Takayuki; Akutsu, Yoichi; *; *; *

JAERI-Research 99-054, p.41 - 0, 1999/09

JAERI-Research-99-054.pdf:1.19MB

no abstracts in English

Journal Articles

Hydration and microstructure of irradiated concretes

*; ; Sukegawa, Takenori; Akutsu, Yoichi; *; *

Nihon Kenchiku Gakkai Kozokei Rombunshu, (517), p.1 - 9, 1999/03

no abstracts in English

Journal Articles

Design and validation test of seismic isolation for ITER

Nakahira, Masataka; Takeda, Nobukazu; Takahashi, Hiroyuki*; Yagenchi, Akira*; Akutsu, Yoichi; Tada, Eisuke; Yabana, Shuichi*

Proceedings of 7th International Conference on Nuclear Engineering (ICONE-7) (CD-ROM), 10 Pages, 1999/00

no abstracts in English

Journal Articles

Modification of JRR-4; Remodeling of reactor building

; ; ; Nakajima, Teruo; Akutsu, Yoichi; ; Naruse, Hideo

UTNL-R-0378, p.6.1 - 6.9, 1999/00

no abstracts in English

Journal Articles

Effect of seismic isolation on the tokamak in ITER

Tsunematsu, Toshihide; Namba, Haruyuki*; Akutsu, Yoichi; Okawa, Yoshinao; Yagenji, Akira; Takeda, Masatoshi*; Yajima, Kensaku*; Nitta, Yoshio*; Kobayashi, Kenichi*; Maeda, Ikuo*; et al.

Fusion Engineering and Design, 41(1-4), p.415 - 420, 1998/09

 Times Cited Count:3 Percentile:32.94(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Study on environmental and mechanical properties of irradiated concrete

*; ; Sukegawa, Takenori; Akutsu, Yoichi; *; *

Nihon Kenchiku Gakkai Kozokei Rombunshu, 0(488), p.1 - 10, 1996/10

no abstracts in English

Journal Articles

R&D of 3-D base isolation system, part 3; The Experimental study on mechanical properties

Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1147 - 1148, 1996/00

no abstracts in English

Journal Articles

R&D-RC structure using electrical insulated reinforcing bar, part 13; Primary test of electrical concrete crack monitoring method

Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1337 - 1338, 1995/00

no abstracts in English

Journal Articles

R&D of seismic isolation system; R&D for fusion

Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; *; *; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1047 - 1048, 1995/00

no abstracts in English

Journal Articles

Probabilistic evaluation of seismic isolation effect with respect to siting of a fusion reactor facility

Takeda, M.*; Okawa, Yoshinao; *; Akutsu, Yoichi; *

Seismic,Shock,and Vibration Isolation 1995 (PVP-Vol. 319), 0, p.317 - 322, 1995/00

no abstracts in English

Journal Articles

Probabilistic evaluation of seismic isolation effect with respect to siting of a fusion reactor facility

Takeda, M.*; Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.45 - 46, 1994/09

no abstracts in English

Journal Articles

Electrical insulation characteristics of $$gamma$$-ray irradiated epoxy-coated reinforcing steel bar

*; Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.907 - 908, 1994/09

no abstracts in English

Journal Articles

R&D of electrical monitoring technique for laminated rubber bearing, Part 1; Electrical characteristics of laminated rubber bearing

Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1727 - 1728, 1994/00

no abstracts in English

Journal Articles

R&D-RC structure using electrical insulated reinforcing bar, Part 12; Monitoring test

*; Akutsu, Yoichi; Okawa, Yoshinao; *; Suzuki, Hideyuki

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.171 - 172, 1994/00

no abstracts in English

Journal Articles

R&D of 3D seismic isolation system; R&D for fusion

Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; *; *; *; *

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1725 - 1726, 1994/00

no abstracts in English

38 (Records 1-20 displayed on this page)