Nonplanar effects in simulations of laser-driven ejecta microjet experiments
Abstract
Recent experiments of laser-driven ejecta microjets performed at OMEGA 60 reveal tortuous jets whereby the jets appear to deviate from their initial trajectory as they travel in vacuum. To understand these data, we perform two dimensional numerical simulations, considering different target thicknesses, pressures, and models of the drive conditions. In particular, modeling the finite laser spot size appears essential in reproducing qualitatively the non-planar shock observed in the experiment. Simulations capture jet deflection by accounting for a slight misalignment of the laser pointing with respect to the groove axis along with spatial variation of the laser pulse intensity. The principal physical mechanism appears to be that lateral momentum is imparted by release waves arising from the non-planar drive. The induced off-axis velocity is small in comparison to the jet axial velocity but integrates into a pronounced deflection over the course of the experiment. The analysis of jet axial and lateral mass distributions is found to be reproduced reasonably by the simulations. Simulated radiographs are in qualitative agreement with the experiments, though their differences point to potential shortcomings in modeling strictly three-dimensional experiments using two-dimensional hydrodynamic simulations. The simple analysis is able to explain part of the observed discrepancy in simulatedmore »
- Authors:
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- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 2335555
- Report Number(s):
- LLNL-JRNL-857931
Journal ID: ISSN 2158-3226; 1086745
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Advances
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 3; Journal ID: ISSN 2158-3226
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; shock compression; lasers; shock waves; hydrodynamics simulations; radiography
Citation Formats
Horwitz, J. K., Sun, Y., Pino, J., Morgan, B. E., Mackay, K. K., Najjar, F. M., Ali, S. J., Eggert, J. H., Ping, Y., Park, H. -S., and Saunders, A. M. Nonplanar effects in simulations of laser-driven ejecta microjet experiments. United States: N. p., 2024.
Web. doi:10.1063/5.0190222.
Horwitz, J. K., Sun, Y., Pino, J., Morgan, B. E., Mackay, K. K., Najjar, F. M., Ali, S. J., Eggert, J. H., Ping, Y., Park, H. -S., & Saunders, A. M. Nonplanar effects in simulations of laser-driven ejecta microjet experiments. United States. https://doi.org/10.1063/5.0190222
Horwitz, J. K., Sun, Y., Pino, J., Morgan, B. E., Mackay, K. K., Najjar, F. M., Ali, S. J., Eggert, J. H., Ping, Y., Park, H. -S., and Saunders, A. M. Fri .
"Nonplanar effects in simulations of laser-driven ejecta microjet experiments". United States. https://doi.org/10.1063/5.0190222. https://www.osti.gov/servlets/purl/2335555.
@article{osti_2335555,
title = {Nonplanar effects in simulations of laser-driven ejecta microjet experiments},
author = {Horwitz, J. K. and Sun, Y. and Pino, J. and Morgan, B. E. and Mackay, K. K. and Najjar, F. M. and Ali, S. J. and Eggert, J. H. and Ping, Y. and Park, H. -S. and Saunders, A. M.},
abstractNote = {Recent experiments of laser-driven ejecta microjets performed at OMEGA 60 reveal tortuous jets whereby the jets appear to deviate from their initial trajectory as they travel in vacuum. To understand these data, we perform two dimensional numerical simulations, considering different target thicknesses, pressures, and models of the drive conditions. In particular, modeling the finite laser spot size appears essential in reproducing qualitatively the non-planar shock observed in the experiment. Simulations capture jet deflection by accounting for a slight misalignment of the laser pointing with respect to the groove axis along with spatial variation of the laser pulse intensity. The principal physical mechanism appears to be that lateral momentum is imparted by release waves arising from the non-planar drive. The induced off-axis velocity is small in comparison to the jet axial velocity but integrates into a pronounced deflection over the course of the experiment. The analysis of jet axial and lateral mass distributions is found to be reproduced reasonably by the simulations. Simulated radiographs are in qualitative agreement with the experiments, though their differences point to potential shortcomings in modeling strictly three-dimensional experiments using two-dimensional hydrodynamic simulations. The simple analysis is able to explain part of the observed discrepancy in simulated vs experimental jet masses.},
doi = {10.1063/5.0190222},
journal = {AIP Advances},
number = 3,
volume = 14,
place = {United States},
year = {Fri Mar 08 00:00:00 EST 2024},
month = {Fri Mar 08 00:00:00 EST 2024}
}
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