Symmetry tuning of a near one-dimensional 2-shock platform for code validation at the National Ignition Facility

Journal Article · Fri Apr 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4947223· OSTI ID:22599142

Khan, S. F.; MacLaren, S. A.; Salmonson, J. D.; Ma, T.; Pino, J. E.; Rygg, J. R.; Field, J. E.; Tommasini, R.; Ralph, J. E.; Turnbull, D. P.; Baker, K. L.; Benedetti, L. R.; Bradley, D. K.; Celliers, P. M.; Dewald, E. L.; Dittrich, T. R.; Berzak Hopkins, L.; Izumi, N.; Kervin, M. L.; Nagel, S. R. ^[1] ; others, and

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

We introduce a new quasi 1-D implosion experimental platform at the National Ignition Facility designed to validate physics models as well as to study various Inertial Confinement Fusion aspects such as implosion symmetry, convergence, hydrodynamic instabilities, and shock timing. The platform has been developed to maintain shell sphericity throughout the compression phase and produce a round hot core at stagnation. This platform utilizes a 2-shock 1 MJ pulse with 340 TW peak power in a near-vacuum Au Hohlraum and a CH ablator capsule uniformly doped with 1% Si. We have performed several inflight radiography, symmetry capsule, and shock timing experiments in order to tune the symmetry of the capsule to near round throughout several epochs of the implosion. Adjusting the relative powers of the inner and outer cones of beams has allowed us to control the drive at the poles and equator of the capsule, thus providing the mechanism to achieve a spherical capsule convergence. Details and results of the tuning experiments are described.

• OSTI ID: 22599142
• Journal Information: Physics of Plasmas, Vol. 23, Issue 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
CAPSULES
COMPRESSION
CONVERGENCE
DOPED MATERIALS
HYDRODYNAMIC MODEL
IMPLOSIONS
INERTIAL CONFINEMENT
INSTABILITY
ONE-DIMENSIONAL CALCULATIONS
PEAK LOAD
SPHERICAL CONFIGURATION
SYMMETRY
THERMONUCLEAR IGNITION
TUNING
US NATIONAL IGNITION FACILITY
VALIDATION