Present status and future prospect of Fast Ignition Realization Experiment (FIREX) Project at ILE, Osaka

Nishimura, Hiroaki; Azechi, H.; Mima, K.; Fujimoto, Yasushi; Fujioka, Shinsuke; Homma, Hiroomi; Jitsuno, T.; Johzaki, Tomoyuki; Koga, Mayuko; Kawanaka, Junji; Kawasaki, T.; Miyanaga, Noriaki; Murakami, Hajime; Murakami, M.; Nagatomo, Hideo; Morio, N.; Nagai, Kotobu; Nakai, M.; Nakamura, Toshiaki; Nakazato, Tomoharu; Nakata, Yoshiki; Nishihara, K.; Norimatsu, T.; Sakawa, Y.; Sarukura, Nobuhiko; Shigemori, K.; Shimizu, Toshihiko; Shiraga, H.; Sueda, Keiichi; Tsubakimoto, Koji; Iwamoto, A.; Mito, T.; Sakagami, Hiroyuki; Isobe, M.; Ozaki, T.; Motojima, O.; Kodama, R.; Tanaka, K. A.; Habara, H.; Kondo, Kotaro; Nakao, Yoshitaka; Sentoku, Y.; Sunahara, A.; Taguchi, Toshihiro; Kanabe, T.

doi:10.1063/1.3326327

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“…For carrying out fast ignition experiments using increased heating laser energy, an ultra-high intensity laser (LFEX) was constructed at Osaka University (Miyanaga et al, 2006), and also the OMGA-EP laser system was constructed at the University of Rochester (Maywar et al, 2008). Osaka University started the fast ignition realization experiment (FIREX) in 2009 (Nishimura et al, 2010). This project has two phases.…”

Section: Introductionmentioning

confidence: 99%

Generation of pre-formed plasma and its reduction for fast-ignition

et al. 2012

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We investigated generation of pre-formed plasma on plates and inside cone targets due to a pre-pulse before the arrival of the main ultra-intense laser pulse in the fast-ignition scheme of the inertial confinement fusion. We estimated the pre-pulse level to be 130 mJ for LFEX laser used in the 2009 FIREX experiment, and the density gradient scale length of the preformed plasma inside the cone target to be 27-47 microns between the critical and 1/10 of the critical density, based on the two-dimensional radiation hydrodynamic simulations. In order to reduce the generation of pre-formed plasma, we investigated a thin CH foil pre-pulse absorber, and proposed using a cone target with a pointed tip. We simulated CH plasma expansion to show that the CH foils works as a pre-pulse absorber. We also show the aluminum pointed tip of the cone target can delay the shock arrival time by 20 ps, much longer than the delay for the 10 micron thickness gold tip used in the typical implosion of GXII at Osaka University.

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Section: Introductionmentioning

confidence: 99%