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  • Received: Mar. 11, 2019

    Accepted: Jun. 6, 2019

    Posted: Nov. 14, 2019

    Published Online: Nov. 8, 2019

    The Author Email: Ramis Rafael (rafael.ramis@upm.es)

    DOI: 10.1063/1.5095612

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    Rafael Ramis, Benoit Canaud, Mauro Temporal, Warren J. Garbett, Franck Philippe. Analysis of three-dimensional effects in laser driven thin-shell capsule implosions[J]. Matter and Radiation at Extremes, 2019, 4(5): 055402

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Matter and Radiation at Extremes, Vol. 4, Issue 5, 055402 (2019)

Analysis of three-dimensional effects in laser driven thin-shell capsule implosions

Rafael Ramis1,a), Benoit Canaud2, Mauro Temporal3, Warren J. Garbett4, and Franck Philippe2

Author Affiliations

  • 1E.T.S.I. Aeronáutica y del Espacio, Universidad Politécnica de Madrid, P. Cardenal Cisneros 3, E-28040, Madrid, Spain
  • 2CEA, DAM, DIF, 91297 Arpajon Cedex, France
  • 3Centre de Mathématiques et de Leurs Applications, ENS Cachan and CNRS, 61 Av. du President Wilson, 94235 Cachan Cedex, France
  • 4AWE plc, Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom

Abstract

Three-dimensional (3D) hydrodynamic numerical simulations of laser driven thin-shell gas-filled microballoons have been carried out using the computer code MULTI-3D [Ramis et al., Phys. Plasmas 21, 082710 (2014)]. The studied configuration corresponds to experiments carried at the ORION laser facility [Hopps et al., Plasma Phys. Controlled Fusion 57, 064002 (2015)]. The MULTI-3D code solves single-temperature hydrodynamics, electron heat transport, and 3D ray tracing with inverse bremsstrahlung absorption on unstructured Lagrangian grids. Special emphasis has been placed on the genuine 3D effects that are inaccessible to calculations using simplified 1D or 2D geometries. These include the consequences of (i) a finite number of laser beams (10 in the experimental campaign), (ii) intensity irregularities in the beam cross-sectional profiles, (iii) laser beam misalignments, and (iv) power imbalance between beams. The consequences of these imperfections have been quantified by post-processing the numerical results in terms of capsule nonuniformities (synthetic emission and absorption images) and implosion efficiency (convergence ratio and neutron yield). Statistical analysis of these outcomes allows determination of the laser tolerances that guarantee a given level of target performance.