Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]
Abstract
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.
- Authors:
-
- Univ. of Rochester, Rochester, NY (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. Bordeaux-CNRS-CEA, Talence (France)
- Publication Date:
- Research Org.:
- Univ. of Rochester, Rochester, NY (United States). Lab for Laser Energetics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- Contributing Org.:
- Laboratory for Laser Energetics, University of Rochester
- OSTI Identifier:
- 1542619
- Alternate Identifier(s):
- OSTI ID: 1546318; OSTI ID: 1756732
- Report Number(s):
- 2018-284, 1507; LLNL-JRNL-811809
Journal ID: ISSN 2470-0045; PLEEE8; 2018-284, 1507, 2467
- Grant/Contract Number:
- NA0003856; AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review E
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 6; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Direct drive; high-energy-density plasmas; inertial confinement fusion; plasma production & heating by laster beams, laser-foil, laser-cluster; laser inertial confinement; optical interferometry
Citation Formats
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., and Regan, S. P. Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]. United States: N. p., 2019.
Web. doi:10.1103/PhysRevE.99.063208.
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. Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]. United States. https://doi.org/10.1103/PhysRevE.99.063208
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., and Regan, S. P. Mon .
"Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]". United States. https://doi.org/10.1103/PhysRevE.99.063208. https://www.osti.gov/servlets/purl/1542619.
@article{osti_1542619,
title = {Direct-drive measurements of laser-imprint-induced shock velocity nonuniformities [First direct-drive measurements of laser-imprint-induced shock velocity nonuniformities]},
author = {Peebles, J. L. and Hu, S. X. and Theobald, W. and Goncharov, V. N. and Whiting, N. and Celliers, P. M. and Ali, S. J. and Duchateau, G. and Campbell, E. M. and Boehly, T. R. and Regan, S. P.},
abstractNote = {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.},
doi = {10.1103/PhysRevE.99.063208},
journal = {Physical Review E},
number = 6,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}
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Works referencing / citing this record:
Modeling the solid-to-plasma transition for laser imprinting in direct-drive inertial confinement fusion
journal, September 2019
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