Neutron diagnostics in Fast Ignition experiments with GEKKO-XII and LFEX lasers

ORAL

Abstract

The fast ignition integrated experiment was conducted on GEKKO-XII laser facility by using LFEX laser with the energy up to 1.4 kJ in a 1.2 ps pulse in 2010. Neutron yield enhancement was observed by a developed liquid scintillation detector [1]. DD fusion neutron signal was correctly separated from intense background signals originated from 1) $\gamma $ rays from the targets and scattered by experimental bay wall, and 2) neutrons by ($\gamma $-n) reaction in the target vacuum chamber or diagnostics instruments. The DD fusion neutron yield up to (3.5$\pm $1.3)$\times $10$^{7}$ was obtained with 300J of the additional heating laser energy, whereas 1$\times $10$^{6}$ was obtained in without heating case. The neutron yield was higher than that reported in the previous work [2]. \\[4pt] [1] T. Nagai, et. al., Japanese Journals of Applied Physics, (to be published) \\[0pt] [2] R. Kodama, et. al., Nature, \textbf{418}, 933-934 (2002)

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Authors

  • Yasunobu Arikawa

    • Institute of Laser Engineering, Osaka University

  • Hirokazu Hosoda

    • Institute of Laser Engineering, Osaka University

  • Takahiro Nagai

    • Institute of Laser Engineering, Osaka University

  • Mitsuo Nakai

    • Institute of Laser Engineering, Osaka University

  • Takeshi Watari

    • Institute of Laser Engineering, Osaka University

  • Hirotaka Nakamura

    • Institute of Laser Engineering, Osaka University

  • Shinsuke Fujioka

    • Institute of Laser Engineering, Osaka University

  • Hiroyuki Shiraga

    • Institute of Laser Engineering, Osaka University

  • Hideo Nagatomo

    • Institute of Laser Engineering, Osaka University
    • Osaka University, ILE

  • Atsushi Sunahara

    • Institute of Laser Engineering, Osaka University
    • Institute for Laser Technology

  • Tomoyuki Johzaki

    • Institute of Laser Engineering, Osaka University
    • Institute for Laser Technology

  • Takayoshi Norimatsu

    • National Institute for Fusion Science
    • Institute of Laser Engineering, Osaka University

  • Hiroshi Azechi

    • Institute of Laser Engineering, Osaka University

  • Tetsuo Ozaki

    • National Institute for Fusion Science

  • Hitoshi Sakagami

    • National Institute for Fusion Science