S. Ohira
Osaka University
6 Papers
68 Citations
S. Ohira is an academic researcher from Osaka University. The author has contributed to research in topics: Laser & Inertial confinement fusion. The author has an hindex of 5, co-authored 6 publications.
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Papers
High-energy-density plasmas generation on GEKKO-LFEX laser facility for fast-ignition laser fusion studies and laboratory astrophysics
Shinsuke Fujioka,Zhe Zhang,Norimasa Yamamoto,S. Ohira,Y. Fujii,K. Ishihara,Tomoyuki Johzaki,Atsushi Sunahara,Yasunobu Arikawa,Keisuke Shigemori,Y. Hironaka,Youichi Sakawa,Yoshiki Nakata,J. Kawanaka,Hideo Nagatomo,Hiroyuki Shiraga,N. Miyanaga,Takayoshi Norimatsu,Hiroaki Nishimura,Hiroshi Azechi +19 more
TL;DR: In this paper, the authors describe improvement of the LFEX laser and investigations of advanced target design to increase the energy coupling efficiency of the fast-ignition scheme, which is a source of safe, secure, environmentally sustainable fusion energy.
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Integrated experiments of fast ignition targets by Gekko-XII and LFEX lasers
Hiroyuki Shiraga,Shinsuke Fujioka,Mitsuo Nakai,Takeshi Watari,Hirotaka Nakamura,Yasunobu Arikawa,H. Hosoda,Takahiro Nagai,Mayuko Koga,H. Kikuchi,Y. Ishii,T. Sogo,Keisuke Shigemori,Hiroaki Nishimura,Zhe Zhang,Minoru Tanabe,S. Ohira,Y. Fujii,T. Namimoto,Yoichi Sakawa,O. Maegawa,T. Ozaki,Kazuo Tanaka,Hideaki Habara,T. Iwawaki,K. Shimada,Hideo Nagatomo,Tomoyuki Johzaki,Atsushi Sunahara,Masakatsu Murakami,Hitoshi Sakagami,Toshihiro Taguchi,Takayoshi Norimatsu,H. Homma,Y. Fujimoto,Akifumi Iwamoto,N. Miyanaga,J. Kawanaka,Takahisa Jitsuno,Yoshiki Nakata,Koji Tsubakimoto,Keiichi Sueda,N. Morio,S. Matsuo,T. Kawasaki,K. Sawai,K. Tsuji,H. Murakami,T. Kanabe,Ko. Kondo,Ryosuke Kodama,Nobuhiko Sarukura,Toshihiko Shimizu,K. Mima,Hiroshi Azechi +54 more
TL;DR: Kodama et al. as mentioned in this paper used a hollow gold cone to guide the short-pulse laser at the time of the maximum compression, and the shell target was imploded with 9 or 12 beams of Gekko-XII laser (527) with energy of 300 J/beam in a 1.5 ns pulse.
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Monochromatic x-ray radiography for areal-density measurement of inertial fusion energy fuel in fast ignition experiment.
Shinsuke Fujioka,T. Fujiwara,Minoru Tanabe,Hiroaki Nishimura,Hideo Nagatomo,S. Ohira,Yuichi Inubushi,Hiroyuki Shiraga,Hiroshi Azechi +8 more
TL;DR: In the experiment, 2.8 or 5.2 keV backlight x-rays emitted from laser-irradiated polyvinyl chloride or vanadium foils were selectively imaged by spherically bent quartz crystals with discriminating the out-of-band emission from the fuel core, achieving 24 μm and 100 ps of spatial and temporal resolutions, respectively.
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X-ray backlight measurement of preformed plasma by kJ-class petawatt LFEX laser
S. Ohira,Shinsuke Fujioka,Atsushi Sunahara,Tomoyuki Johzaki,Hideo Nagatomo,S. Matsuo,N. Morio,J. Kawanaka,Yoshiki Nakata,Noriaki Miyanaga,Hiroyuki Shiraga,Hiroaki Nishimura,Hiroshi Azechi +12 more
TL;DR: In this article, a preformed plasma with a density scale length of 40-60 μm was observed by a time and space-resolved x-ray backlight technique using the LFEX laser system at the Institute of Laser Engineering, Osaka University.
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Implosion and heating experiments of fast ignition targets by Gekko-XII and LFEX lasers
Hiroyuki Shiraga,Shinsuke Fujioka,M. Nakai,Takeshi Watari,Hirotaka Nakamura,Yasunobu Arikawa,H. Hosoda,Takao Nagai,Mayuko Koga,H. Kikuchi,Y. Ishii,T. Sogo,Keisuke Shigemori,Hiroaki Nishimura,Zhe Zhang,Minoru Tanabe,S. Ohira,Y. Fujii,T. Namimoto,Yoichi Sakawa,O. Maegawa,T. Ozaki,Kazuo Tanaka,H. Habara,T. Iwawaki,K. Shimada,M. H. Key,Peter Norreys,John Pasley,Hideo Nagatomo,Tomoyuki Johzaki,Atsushi Sunahara,Masakatsu Murakami,Hitoshi Sakagami,Toshihiro Taguchi,Takayoshi Norimatsu,H. Homma,Y. Fujimoto,Akifumi Iwamoto,N. Miyanaga,J. Kawanaka,T. Kanabe,Takahisa Jitsuno,Yoshiki Nakata,Kouji Tsubakimoto,Keiichi Sueda,R. Kodama,Ko. Kondo,N. Morio,S. Matsuo,T. Kawasaki,K. Sawai,K. Tsuji,H. Murakami,Nobuhiko Sarukura,Toshihiko Shimizu,K. Mima,Hiroshi Azechi +57 more
- 01 Nov 2013
TL;DR: In this paper, a deuterated polystyrene shell target was imploded with the 0.53-μm Gekko-XII, and the 1.053- μm beam was injected through a gold cone attached to the shell to generate hot electrons to heat the imploded fuel plasma.
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