Speaker
Mr
Hiroyuki Shiraga
(Japan)
Description
Implosion and heating experiments of Fast Ignition (FI) targets for FIREX-1 project have been performed with Gekko-XII and LFEX lasers at the Institute of Laser Engineering, Osaka University. The goal of the project is to achieve fast heating of the imploded fuel plasma up to 5 keV by injection of the heating laser beam. After the first integrated experiments of Fast Ignition with LFEX laser in 2009, in which we concluded that the existence of the prepulse in the heating laser may have affected the heating efficiency by modifying the hot electron spectrum to unexpected higher energy range, we tried to significantly improve the pulse contrast of the LFEX laser beam. Also we have much improved the plasma diagnostics to be able to observe the plasma even in the hard x-ray harsh environment. In 2010-2011 experiment after the previous IAEA/FEC-23, a plastic (CD) shell target with a hollow gold cone was imploded with Gekko-XII laser. LFEX laser beams were injected into the cone at the time around the maximum implosion. We have successfully observed neutron enhancement up to 3.5x107 with total heating energy of 300 J, which is higher than the yield obtained in the experiment with previous heating laser, PW, in 2002. We found the estimated heating efficiency assuming a uniform temperature rise is at a level of 10-20 %. Fuel heating up to 5 keV is expected with full-spec output of LFEX.
Country or International Organization of Primary Author
Japan
Primary author
Mr
Hiroyuki Shiraga
(Japan)
Co-authors
Prof.
Akifumi Iwamoto
(Nationai Institute for Fusion Science)
Dr
Atsushi Sunahara
(Institute for Laser Technology)
Prof.
Hideaki Habara
(Graduate School of Engineering, Osaka University)
Prof.
Hideo Nagatomo
(Institute of Laser Engineering, Osaka University)
Prof.
Hiroaki Nishimura
(Institute of Laser Engineering, Osaka University)
Dr
Hirofumi Homma
(Institute of Laser Engineering, Osaka University)
Mr
Hirokazu Hosoda
(Institute of Laser Engineering, Osaka University)
Prof.
Hiroshi Azechi
(Institute of Laser Engineering, Osaka University)
Dr
Hirotaka Nakamura
(Institute of Laser Engineering, Osaka University)
Prof.
Hitoshi Sakagami
(Nationai Institute for Fusion Science)
Prof.
Junji Kawanaka
(Institute of Laser Engineering, Osaka University)
Prof.
Kazuo Tanaka
(Graduate School of Engineering, Osaka University)
Dr
Keiichi Sueda
(Graduate School of Engineering, Osaka University)
Prof.
Keisuke Shigemori
(Institute of Laser Engineering, Osaka University)
Dr
Koji Tsubakimoto
(Institute of Laser Engineering, Osaka University)
Prof.
Kunioki Mima
(Institute of Laser Engineering, Osaka University)
Prof.
Masakatsu Murakami
(Institute of Laser Engineering, Osaka University)
Dr
Mayuko Koga
(Institute of Laser Engineering, Osaka University)
Dr
Minoru Tanabe
(Institute of Laser Engineering, Osaka University)
Prof.
Mitsuo Nakai
(Institute of Laser Engineering, Osaka University)
Prof.
Nobuhiko Sarukura
(Institute of Laser Engineering, Osaka University)
Prof.
Noriaki Miyanaga
(Institute of Laser Engineering, Osaka University)
Prof.
Shinsuke Fujioka
(Institute of Laser Engineering, Osaka University)
Mr
Takahiro Nagai
(Institute of Laser Engineering, Osaka University)
Prof.
Takahisa Jitsuno
(Institute of Laser Engineering, Osaka University)
Prof.
Takayoshi Norimatsu
(Institute of Laser Engineering, Osaka University)
Dr
Takeshi Watari
(Institute of Laser Engineering, Osaka University)
Prof.
Tetsuo Ozaki
(Nationai Institute for Fusion Science)
Dr
Tomoyuki Johzaki
(Institute of Laser Engineering, Osaka University)
Dr
Toshihiko Shimizu
(Institute of Laser Engineering, Osaka University)
Prof.
Toshihiro Taguchi
(Faculty of Science and Engineering, Setsunan University)
Dr
Yasunobu Arikawa
(Institute of Laser Engineering, Osaka University)
Dr
Yasushi Fujimoto
(Institute of Laser Engineering, Osaka University)
Prof.
Yoshiki Nakata
(Institute of Laser Engineering, Osaka University)
Prof.
Youichi Sakawa
(Institute of Laser Engineering, Osaka University)
Dr
Zhe Zhang
(Institute of Laser Engineering, Osaka University)
