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Simple Analysis of the Laser-to-Core Energy Coupling Efficiency with Magnetized Fast Isochoric Laser Heating

Shohei SAKATA, Tomoyuki JOHZAKI¹⁾, Seungho LEE, Hiroki MORITA, Kazuki MATSUO, Ryosuke KODAMA, Yasunobu ARIKAWA, Yasuhiko SENTOKU and Shinsuke FUJIOKA

Institute of Laser Engineering, Osaka University, 02-06 Yamada-Oka, Suita, Osaka 565-0871, Japan

1)

Department of Mechanical Systems Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan

(Received 10 January 2019 / Accepted 31 March 2019 / Published 25 September 2019)

Abstract

In this study, we have demonstrated the enhancement of laser-to-core energy coupling using magnetized fast isochoric laser heating on the GEKKO-LFEX laser facility. We achieved a maximum coupling of 8% by applying an external magnetic field, and the coupling gradually degraded with increasing energy of the heating laser, maintaining the pulse duration and the spot diameter constant. The obtained energy couplings are consistent with those obtained using simple calculation models. The models predict that an energy coupling of 20% - 35% can be achieved by an ignition-scale core exhibiting a moderate guiding field and heating laser intensity.

Copyright (c) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

fast isochoric heating, kilo-Tesla magnetic field

DOI: 10.1585/pfr.14.3404138

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