title: Heating efficiency evaluation with mimicking plasma conditions of integrated fast-ignition experiment.
abstract: A series of experiments were carried out to evaluate the energy-coupling efficiency from heating laser to a fuel core in the fast-ignition scheme of laser-driven inertial confinement fusion. Although the efficiency is determined by a wide variety of complex physics, from intense laser plasma interactions to the properties of high-energy density plasmas and the transport of relativistic electron beams (REB), here we simplify the physics by breaking down the efficiency into three measurable parameters: (i) energy conversion ratio from laser to REB, (ii) probability of collision between the REB and the fusion fuel core, and (iii) fraction of energy deposited in the fuel core from the REB. These three parameters were measured with the newly developed experimental platform designed for mimicking the plasma conditions of a realistic integrated fast-ignition experiment. The experimental results indicate that the high-energy tail of REB must be suppressed to heat the fuel core efficiently.
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Shinsuke
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authors.lastname: Fujioka
authors.affiliation: Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan.
authors.forename: Tomoyuki
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authors.lastname: Johzaki
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Arikawa
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Alessio
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authors.lastname: Morace
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Takahito
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authors.lastname: Ikenouchi
authors.affiliation: National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.
authors.forename: Tetsuo
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authors.lastname: Ozaki
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Takahiro
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authors.lastname: Nagai
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Abe
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Sadaoki
authors.initials: S
authors.lastname: Kojima
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Sakata
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Inoue
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Masaru
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authors.lastname: Utsugi
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Shoji
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authors.lastname: Hattori
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
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authors.lastname: Hosoda
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Shigemori
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Youichiro
authors.initials: Y
authors.lastname: Hironaka
authors.affiliation: Institute for Laser Technology, 2-6, Yamada-oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Sunahara
authors.affiliation: National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sakagami
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.|The Graduate School for the Creation of New Photon Industries, 1955-1 Kurematsu, Nishiku, Hamamatsu, Shizuoka, 141-1201, Japan.
authors.forename: Kunioki
authors.initials: K
authors.lastname: Mima
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Fujimoto
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Kohei
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authors.lastname: Yamanoi
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Takayoshi
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authors.lastname: Norimatsu
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Shigeki
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authors.lastname: Tokita
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Yoshiki
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authors.lastname: Nakata
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
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authors.lastname: Kawanaka
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
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authors.lastname: Jitsuno
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
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authors.lastname: Miyanaga
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Mitsuo
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authors.lastname: Nakai
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
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authors.lastname: Nishimura
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Shiraga
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Hideo
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authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka, 565-0871, Japan.
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