Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)
In order to achieve the several hundred Gbar stagnation pressures necessary for inertial confinement fusion ignition, implosion experiments on the National Ignition Facility (NIF) [E. I. Moses et al., Phys. Plasmas 16, 041006 (2009)] require the compression of deuterium-tritium fuel layers by a convergence ratio as high as forty. Such high convergence implosions are subject to degradation by a range of perturbations, including the growth of small-scale defects due to hydrodynamic instabilities, as well as longer scale modulations due to radiation flux asymmetries in the enclosing hohlraum. Due to the broad range of scales involved, and also the genuinely three-dimensional (3D) character of the flow, accurately modeling NIF implosions remains at the edge of current simulation capabilities. This paper describes the current state of progress of 3D capsule-only simulations of NIF implosions aimed at accurately describing the performance of specific NIF experiments. Current simulations include the effects of hohlraum radiation asymmetries, capsule surface defects, the capsule support tent and fill tube, and use a grid resolution shown to be converged in companion two-dimensional simulations. The results of detailed simulations of low foot implosions from the National Ignition Campaign are contrasted against results for more recent high foot implosions. While the simulations suggest that low foot performance was dominated by ablation front instability growth, especially the defect seeded by the capsule support tent, high foot implosions appear to be dominated by hohlraum flux asymmetries, although the support tent still plays a significant role. For both implosion types, the simulations show reasonable, though not perfect, agreement with the data and suggest that a reliable predictive capability is developing to guide future implosions toward ignition.
- OSTI ID:
- 22600241
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 23; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABLATION
ASYMMETRY
CAPSULES
COMPUTERIZED SIMULATION
CONVERGENCE
DEUTERIUM
IMPLOSIONS
INERTIAL CONFINEMENT
PERTURBATION THEORY
PLASMA
RADIATION FLUX
SILICON OXIDES
THERMONUCLEAR IGNITION
THREE-DIMENSIONAL CALCULATIONS
TRITIUM
TWO-DIMENSIONAL CALCULATIONS
US NATIONAL IGNITION FACILITY
ABLATION
ASYMMETRY
CAPSULES
COMPUTERIZED SIMULATION
CONVERGENCE
DEUTERIUM
IMPLOSIONS
INERTIAL CONFINEMENT
PERTURBATION THEORY
PLASMA
RADIATION FLUX
SILICON OXIDES
THERMONUCLEAR IGNITION
THREE-DIMENSIONAL CALCULATIONS
TRITIUM
TWO-DIMENSIONAL CALCULATIONS
US NATIONAL IGNITION FACILITY