Plasma and Fusion Research

Volume 16, 1404099 (2021)

Regular Articles


Preliminary Cryogenic Layering by the Infrared Heating Method Modified with Cone Temperature Control for the Polystyrene Shell FIREX Target
Keisuke IWANO1), Akifumi IWAMOTO1,2), Kohei YAMANOI1), Yasunobu ARIKAWA1), Hideo NAGATOMO1), Mitsuo NAKAI1) and Takayoshi NORIMATSU1)
1)
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
2)
National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
(Received 12 April 2021 / Accepted 8 September 2021 / Published 25 November 2021)

Abstract

The infrared (IR) heating method for a central ignition target with spherical symmetry is modified for the axisymmetric Fast Ignition Realization EXperiment (FIREX) target. The challenge is that the FIREX target pretends to be a thermally spherical shell. Our previous simulation studies (A. Iwamoto et al., Fusion Sci. Technol. 56, 427 (2009), A. Iwamoto et al., J. Phys.: Conf. Ser. 244, 032039 (2010)) have shown that the combination of volumetric heating in a fuel and cone temperature control has the potential to finish a uniform fuel layer. We have developed the IR heating system, dedicated to the FIREX target, with exclusive cone temperature control. The ability of solid fuel layering was examined by using an 826 µm polystyrene (PS) shell with a gold cone of 1.2 mm in length instead of the 500 µm FIREX target for easy observation. The system could control the profile of a solid fuel layer in the PS shell target. Eventually, the solid layer with the best sphericity of 92% was formed, and the RMS roughness of the inner surface was 44 - 49 µm in modes 1 to 100 and 14 - 26 µm in modes 5 to 100.


Keywords

fast ignition laser fusion, cryogenic target, solid fuel layering, infrared heating, cone temperature control

DOI: 10.1585/pfr.16.1404099


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