Study of fast ignition target design for ignition and burning experiments. (13th September 2019)

• Record Type: Journal Article
• Authors: Nagatomo, H.; Johzaki, T.; Asahina, T.; Hata, M.; Sentoku, Y.; Mima, K.; Sakagami, H.
• Is Part Of: Nuclear fusion. Volume 59:Number 10(2019:Oct.)
• Publication Date: 2019-09-13
• Subjects: fast ignition -- radiation hydrodynamic -- implosion; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/ab3a5d
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: For the fast ignition of laser fusion, a reliable target design is required for an ignition scale target. This paper shows the first optimized target design for the implosion phase of fast ignition, which is scalable to larger targets. The requirements from the heating process are taken account. In conclusion, a target can be highly compressed using multi-step laser pulse irradiation to a solid spherical target with an inserted gold cone. In an 8 kJ scale implosion, the maximum areal density of deuterium–tritium fuel reaches 0.39 g cm −2 according to 2D simulation results, which is 62% of the case without the cone. Based on the similarity rule, we estimate that the requirement of the implosion laser energy for ignition scale targets ( ρR max =1.0 g cm −2 ) is 135 kJ.