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  • Received: Feb. 27, 2014

    Accepted: Mar. 31, 2014

    Posted: Jan. 22, 2019

    Published Online: Dec. 3, 2018

    The Author Email: Mauro Temporal (mauro.temporal@hotmail.com)

    DOI: 10.1017/hpl.2014.12

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    Mauro Temporal, Benoit Canaud, Warren J. Garbett, Rafael Ramis, Stefan Weber. Irradiation uniformity at the Laser MegaJoule facility in the context of the shock ignition scheme[J]. High Power Laser Science and Engineering, 2014, 2(2): 020000e8

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High Power Laser Science and Engineering, Vol. 2, Issue 2, 020000e8 (2014)

Irradiation uniformity at the Laser MegaJoule facility in the context of the shock ignition scheme

Mauro Temporal1,†,*, Benoit Canaud2, Warren J. Garbett3, Rafael Ramis4, and Stefan Weber5

Author Affiliations

  • 1Centre de Mathématiques et de Leurs Applications, ENS Cachan and CNRS, 61 Av. du President Wilson, Cachan Cedex, France
  • 2CEA, DIF, Arpajon Cedex, France
  • 3AWE plc, Aldermaston, Reading, Berkshire, United Kingdom
  • 4ETSI Aeronáuticos, Universidad Politécnica de Madrid, Madrid, Spain
  • 5ELI-Beamlines, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

Abstract

The use of the Laser MegaJoule facility within the shock ignition scheme has been considered. In the first part of the study, one-dimensional hydrodynamic calculations were performed for an inertial confinement fusion capsule in the context of the shock ignition scheme providing the energy gain and an estimation of the increase of the peak power due to the reduction of the photon penetration expected during the high-intensity spike pulse. In the second part, we considered a Laser MegaJoule configuration consisting of 176 laser beams that have been grouped providing two different irradiation schemes. In this configuration the maximum available energy and power are 1.3 MJ and 440 TW. Optimization of the laser–capsule parameters that minimize the irradiation non-uniformity during the first few ns of the foot pulse has been performed. The calculations take into account the specific elliptical laser intensity profile provided at the Laser MegaJoule and the expected beam uncertainties. A significant improvement of the illumination uniformity provided by the polar direct drive technique has been demonstrated. Three-dimensional hydrodynamic calculations have been performed in order to analyse the magnitude of the azimuthal component of the irradiation that is neglected in two-dimensional hydrodynamic simulations.

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