Spontaneous collimation of relativistic electron beams due to a high-contrast laser in conjunction with a cone-shaped target

ORAL

Abstract

Achieving Inertial Fusion Energy (IFE) through Inertial Confinement Fusion (ICF) requires a high conversion efficiency of laser energy into the internal energy of the fuel. The fast ignition, which directly heats the fuel with a heating laser, is potentially highly efficient. However, the huge divergence angle of the relativistic electron beam (REB) generated by the heating laser makes ignition unrealistic.

Here, we demonstrate the spontaneous collimation of REB due to a high-contrast laser in conjunction with a cone-shaped target. When the high-contrast laser propagates inside the cone, it reflects on the cone walls, directing the laser toward the central axis of the cone. Consequently, the electrons accelerated at the cone tip are directed toward the central axis of the cone, resulting in the spontaneous collimation of REB.

We utilized a tracer target to observe the propagation of REB in this study. The experiment was conducted on a petawatt kilojoule-class laser, LFEX, at Osaka University. A plasma mirror was placed just before the target irradiation to achieve high contrast in the laser. This presentation will discuss the details of the experiment and the results obtained.

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Presenters

  • Ryunosuke Takizawa

    Institute of Laser Engineering, Osaka University

Authors

  • Ryunosuke Takizawa

    Institute of Laser Engineering, Osaka University

  • Alessio Morace

    Institute of Laser Engineering, Osaka University

  • Yuki Abe

    Graduate School of Engineering, Osaka University

  • Yasunobu Arikawa

    Institute of Laser Engineering, Osaka University

  • Baojun Zhu

    Institute of Laser Engineering, Osaka University

  • Hiroki Morita

    Faculty of Engineering, Utsunomiya University

  • Zechen Lan

    Institute of Laser Engineering, Osaka University

  • Jinyuan Dun

    Institute of Laser Engineering, Osaka University

  • Takumi Tsuido

    Institute of Laser Engineering, Osaka University

  • Karaki Yuga

    Graduate School of Science, Osaka University, Institute of Laser Engineering, Osaka University

  • Hiroki Matsubara

    Institute of Laser Engineering, Osaka University, Graduate School of Science, Osaka University

  • King Fai Farley Law

    Institute of Laser Engineering, Osaka University

  • Chang Liu

    Institute of Laser Engineering, Osaka University

  • Kazuki Matsuo

    Institute of Laser Engineering, Osaka Universityv

  • Akifumi Yogo

    Institute of Laser Engineering, Osaka University

  • Akifumi Iwamoto

    National Institute for Fusion Science

  • Hideo Nagatomo

    Institute of Laser Engineering, Osaka University

  • Tomoyuki Johzaki

    Hiroshima Univ, Graduate School of Advanced Science and Engineering, Hiroshima University

  • Mitsuo Nakai

    Institute of Laser Engineering, Osaka University

  • Hiroyuki Shiraga

    Osaka Univ

  • Ryosuke Kodama

    Institute of Laser Engineering, Osaka University

  • Yasuhiko Sentoku

    Institute of Laser Engineering, Osaka Univ, Institute of Laser Engineering, Osaka University

  • Shinsuke Fujioka

    Osaka University