Low initial aspect-ratio direct-drive target designs for shock- or self-ignition in the context of the laser Megajoule

Brandon, V. and Canaud, B. and Temporal, Mauro and Ramis Abril, Rafael (2014). Low initial aspect-ratio direct-drive target designs for shock- or self-ignition in the context of the laser Megajoule. "Nuclear Fusion", v. 54 (n. 8); pp.. ISSN 0029-5515. https://doi.org/10.1088/0029-5515/54/8/083016.

Description

Title: Low initial aspect-ratio direct-drive target designs for shock- or self-ignition in the context of the laser Megajoule
Author/s:
  • Brandon, V.
  • Canaud, B.
  • Temporal, Mauro
  • Ramis Abril, Rafael
Item Type: Article
Título de Revista/Publicación: Nuclear Fusion
Date: June 2014
ISSN: 0029-5515
Volume: 54
Subjects:
Freetext Keywords: direct drive, LMJ, inertial confinement fusion, target design
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Física Aplicada a las Ingenierías Aeronáutica y Naval
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Analysis of low initial aspect ratio direct-drive target designs is carried out by varying the implosion velocity and the fuel mass. Starting from two different spherical targets with a given 300?g-DT mass, optimization of laser pulse and drive power allows to obtain a set of target seeds referenced by their peak implosion velocities and initial aspect ratio (A = 3 and A = 5). Self-ignition is achieved with higher implosion velocity for A = 5-design than for A = 3-design. Then, rescaling is done to extend the set of designs to a huge amount of mass, peak kinetic energies and peak areal densities. Self-ignition kinetic energy threshold Ek is characterized by a dependance of Ek ? v? with ?-values which depart from self-ignition models. Nevertheless, self-ignition energy is seen lower for smaller initial aspect ratio. An analysis of Two-Plasmons Decay threshold and Rayleigh?Taylor instability e-folding is carried out and it is shown that two-plasmon decay threshold is always overpassed for all designs. The hydrodynamic stability analysis is performed by embedded models to deal with linear and non-linear regime. It is found that the A = 5-designs are always at the limit of disruption of the shell.

More information

Item ID: 35812
DC Identifier: http://oa.upm.es/35812/
OAI Identifier: oai:oa.upm.es:35812
DOI: 10.1088/0029-5515/54/8/083016
Official URL: http://iopscience.iop.org/0029-5515/54/8/083016/
Deposited by: Memoria Investigacion
Deposited on: 25 Jun 2015 16:43
Last Modified: 25 Jun 2015 16:43
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