Analysis of the symmetry of the direct-drive target implosion under laser pulse of a megajoule scale

The class of direct-drive targets for the laser pulse of a megajoule scale is considered in the work. A distinctive feature of the design of these targets is a relatively low aspect ratio (outer DT-shell radius shell thickness, A ∼ 10) to provide greater compression stability. The irradiation of the...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-05, Vol.717 (1), p.12032
Main Authors: Demchenko, N N, Gus'kov, S Yu, Kuchugov, P A, Rozanov, V B, Stepanov, R V, Vergunova, G A, Yakhin, R A, Zmitrenko, N V
Format: Article
Language:English
Subjects:
Energy absorption
Inhomogeneity
Irradiation
Lasers
Low aspect ratio
Neodymium lasers
Nuclear fuels
Physics
Surface stability
Two dimensional models
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Summary:The class of direct-drive targets for the laser pulse of a megajoule scale is considered in the work. A distinctive feature of the design of these targets is a relatively low aspect ratio (outer DT-shell radius shell thickness, A ∼ 10) to provide greater compression stability. The irradiation of the target surface is carried out by the shaped laser pulse on 2ω of Nd-laser. The influence of laser energy absorption inhomogeneity on the parameters of compression and burning of thermonuclear fuel on the final stage of implosion is studied in the work based on 1D and 2D numerical calculations. The results of 2D modeling show that in the case of target's offset from the point of beams crossing significantly greater reduction in the neutron yield is observed than in the case when only irregularities caused by the geometry of irradiation by the finite number of beams are taken into account.
ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/717/1/012032