Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]

Peebles, J. L.; Hu, S. X.; Theobald, W.; Goncharov, V. N.; Whiting, N.; Celliers, P. M.; Ali, S. J.; Duchateau, G.; Campbell, E. M.; Boehly, T. R.; Regan, S. P.

doi:10.1103/PhysRevE.99.063208

Title: Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]

Journal Article · Mon Jun 24 00:00:00 EDT 2019 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.99.063208· OSTI ID:1542619

Peebles, J. L. ^[1]; Hu, S. X. ^[1]; Theobald, W. ^[1]; Goncharov, V. N. ^[1]; Whiting, N. ^[1]; Celliers, P. M. ^[2]; Ali, S. J. ^[2]; Duchateau, G. ^[3]; Campbell, E. M. ^[1]; Boehly, T. R. ^[1]; Regan, S. P. ^[1]

Univ. of Rochester, Rochester, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. Bordeaux-CNRS-CEA, Talence (France)

Perturbations in the velocity profile of a laser-ablation-driven shock wave seeded by speckle in the spatial beam intensity (i.e., laser imprint) have been measured. Direct measurements of these velocity perturbations were recorded using a two-dimensional high-resolution velocimeter probing plastic material shocked by a 100-ps picket laser pulse from the OMEGA laser system. The measured results for experiments with one, two, and five overlapping beams incident on the target clearly demonstrate a reduction in long-wavelength (>25–μm) perturbations with an increasing number of overlapping laser beams, consistent with theoretical expectations. Furthermore, these experimental measurements are crucial to validate radiation-hydrodynamics simulations of laser imprint for laser direct drive inertial confinement fusion research since they highlight the significant (factor of 3) underestimation of the level of seeded perturbation when the microphysics processes for initial plasma formation, such as multiphoton ionization are neglected.

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Research Organization:: Univ. of Rochester, Rochester, NY (United States). Lab for Laser Energetics; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: Laboratory for Laser Energetics, University of Rochester

Grant/Contract Number:: NA0003856; AC52-07NA27344

OSTI ID:: 1542619

Alternate ID(s):: OSTI ID: 1546318; OSTI ID: 1756732

Report Number(s):: 2018-284, 1507; LLNL-JRNL-811809; PLEEE8; 2018-284, 1507, 2467

Journal Information:: Physical Review E, Vol. 99, Issue 6; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Title: Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]

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