Hydrodynamic instability experiments with three-dimensional modulations at the National Ignition Facility

Smalyuk, V. A.; Weber, S. V.; Casey, D. T.; Clark, D. S.; Field, J. E.; Haan, S. W.; Hamza, A. V.; Hoover, D. E.; Landen, O. L.; Nikroo, A.; Robey, H. F.; Weber, C. R.

doi:10.1017/hpl.2015.12

Title: Hydrodynamic instability experiments with three-dimensional modulations at the National Ignition Facility

Journal Article · Thu Jun 18 00:00:00 EDT 2015 · High Power Laser Science and Engineering

DOI:https://doi.org/10.1017/hpl.2015.12· OSTI ID:1234594

Smalyuk, V. A. ^[1]; Weber, S. V. ^[1]; Casey, D. T. ^[1]; Clark, D. S. ^[1]; Field, J. E. ^[1]; Haan, S. W. ^[1]; Hamza, A. V. ^[1]; Hoover, D. E. ^[2]; Landen, O. L. ^[1]; Nikroo, A. ^[2]; Robey, H. F. ^[1]; Weber, C. R. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

The first hydrodynamic instability growth measurements with three-dimensional (3D) surface-roughness modulations were performed on CH shell spherical implosions at the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)]. The initial capsule outer-surface amplitudes were increased approximately four times, compared with the standard specifications, to increase the signal-to-noise ratio, helping to qualify a technique for measuring small 3D modulations. The instability growth measurements were performed using x-ray through-foil radiography based on time-resolved pinhole imaging. Averaging over 15 similar images significantly increased the signal-to-noise ratio, making possible a comparison with 3D simulations. At a convergence ratio of ~2.4, the measured modulation levels were ~3 times larger than those simulated based on the growth of the known imposed initial surface modulations. Several hypotheses are discussed, including increased instability growth due to modulations of the oxygen content in the bulk of the capsule. In conclusion, future experiments will be focused on measurements with standard 3D ‘native-roughness’ capsules as well as with deliberately imposed oxygen modulations.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1234594

Report Number(s):: LLNL-JRNL-667997; applab

Journal Information:: High Power Laser Science and Engineering, Vol. 3; ISSN 2095-4719

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 18 works

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References (16)

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Hydrodynamic instability growth of three-dimensional, “native-roughness” modulations in x-ray driven, spherical implosions at the National Ignition Facility Smalyuk, V. A.; Weber, S. V.; Casey, D. T. Physics of Plasmas, Vol. 22, Issue 7 https://doi.org/10.1063/1.4926591	journal	July 2015
Experimental results of radiation-driven, layered deuterium-tritium implosions with adiabat-shaped drives at the National Ignition Facility Smalyuk, V. A.; Robey, H. F.; Döppner, T. Physics of Plasmas, Vol. 23, Issue 10 https://doi.org/10.1063/1.4964919	journal	October 2016
Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility Smalyuk, V. A.; Weber, C. R.; Robey, H. F. Physics of Plasmas, Vol. 24, Issue 4 https://doi.org/10.1063/1.4980002	journal	April 2017
Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility Martinez, D. A.; Smalyuk, V. A.; MacPhee, A. G. Physics of Plasmas, Vol. 24, Issue 10 https://doi.org/10.1063/1.4995568	journal	October 2017
Mitigation of X-ray shadow seeding of hydrodynamic instabilities on inertial confinement fusion capsules using a reduced diameter fuel fill-tube MacPhee, A. G.; Smalyuk, V. A.; Landen, O. L. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025183	journal	May 2018
Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility Pickworth, L. A.; Hammel, B. A.; Smalyuk, V. A. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025188	journal	May 2018
Hydrodynamic instabilities seeded by the X-ray shadow of ICF capsule fill-tubes MacPhee, A. G.; Smalyuk, V. A.; Landen, O. L. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5037816	journal	August 2018
Theoretical investigations on melting/crystallization kinetics in overheated/overcooled aluminum at high pressures Xiang, Meizhen; Jiang, Songqing; Chen, Jun Journal of Applied Physics, Vol. 126, Issue 12 https://doi.org/10.1063/1.5118678	journal	September 2019

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