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Title: Ion kinetic effects on the ignition and burn of inertial confinement fusion targets: A multi-scale approach

In this article, we study the hydrodynamics and burn of the thermonuclear fuel in inertial confinement fusion pellets at the ion kinetic level. The analysis is based on a two-velocity-scale Vlasov-Fokker-Planck kinetic model that is specially tailored to treat fusion products (suprathermal α-particles) in a self-consistent manner with the thermal bulk. The model assumes spherical symmetry in configuration space and axial symmetry in velocity space around the mean flow velocity. A typical hot-spot ignition design is considered. Compared with fluid simulations where a multi-group diffusion scheme is applied to model α transport, the full ion-kinetic approach reveals significant non-local effects on the transport of energetic α-particles. This has a direct impact on hydrodynamic spatial profiles during combustion: the hot spot reactivity is reduced, while the inner dense fuel layers are pre-heated by the escaping α-suprathermal particles, which are transported farther out of the hot spot. We show how the kinetic transport enhancement of fusion products leads to a significant reduction of the fusion yield.
Authors:
;  [1] ;  [2]
  1. CEA/DIF, 91297 Arpajon Cedex (France)
  2. Bordeaux University-CNRS-CEA-CELIA, 33405 Talence Cedex (France)
Publication Date:
OSTI Identifier:
22423772
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALPHA PARTICLES; AXIAL SYMMETRY; COMBUSTION; DIFFUSION EQUATIONS; ELECTRON BEAM TARGETS; FOKKER-PLANCK EQUATION; FUSION YIELD; HYDRODYNAMICS; INERTIAL CONFINEMENT; MULTIGROUP THEORY; REACTIVITY; SIMULATION; SPHERICAL CONFIGURATION; THERMONUCLEAR FUELS; THERMONUCLEAR IGNITION