Demonstration of the Shock-Timing Technique for Ignition Targets on the National Ignition Facility

Journal Article · Fri Mar 06 04:00:00 EST 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3078422· OSTI ID:948810

Boehly, T R ^[1]; Munro, D; Celliers, P M; Olson, R E; Hicks, D G; Goncharov, V N; Collins, G W; Robey, R F; Hu, S X; Marozas, J A; Sangster, T C; Landen, O L; Meyerhofer, D D

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1. Laboratory for Laser Energetics, University of Rochester, Rochester, NY

A high-performance inertial confinement fusion capsule is compressed by multiple shock waves before it implodes. To minimize the entropy acquired by the fuel, the strength and timing of those shock waves must be accurately controlled. Ignition experiments at the National Ignition Facility (NIF) will employ surrogate targets designed to mimic ignition targets while making it possible to measure the shock velocities inside the capsule. A series of experiments on the OMEGA laser facility [Boehly et al., Opt. Commun. 133, 495 (1997)] validated those targets and the diagnostic techniques proposed. Quartz was selected for the diagnostic window and shock-velocity measurements were demonstrated in Hohlraum targets heated to 180 eV. Cryogenic experiments using targets filled with liquid deuterium further demonstrated the entire timing technique in a Hohlraum environment. Direct-drive cryogenic targets with multiple spherical shocks were used to further validate this technique, including convergence effects at relevant pressures (velocities) and sizes. These results provide confidence that shock velocity and timing can be measured in NIF ignition targets, allowing these critical parameters to be optimized.

• Research Organization: Laboratory for Laser Energetics, University of Rochester
• Sponsoring Organization: USDOE
• DOE Contract Number: FC52-08NA28302
• OSTI ID: 948810
• Report Number(s): DOE/NA/28302-873; 2008-88, 1851
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 16; ISSN 1070-664X
• Country of Publication: United States
• Language: English