Validation of implosion modeling through direct-drive shock timing experiments at the National Ignition Facility

Srinivasan, A.; Boehly, T. R.; Marshall, M. C.; Polsin, D. N.; Radha, P. B.; Rosenberg, M. J.; Shvydky, A.; Cao, D.; Goncharov, V. N.; Hu, S. X.; Marozas, J.; Miller, S.; Regan, S. P.; Celliers, P. M.; Fratanduono, D. E.; Hohenberger, M.

doi:10.1103/physreve.109.045209

Title: Validation of implosion modeling through direct-drive shock timing experiments at the National Ignition Facility

Journal Article · 24 April 2024 · Physical Review. E

DOI: https://doi.org/10.1103/physreve.109.045209 · OSTI ID:2352265

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University of Rochester, NY (United States); California Institute of Technology (CalTech), Pasadena, CA (United States); Laboratory for Laser Energetics, University of Rochester
University of Rochester, NY (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Precise modeling of shocks in inertial confinement fusion implosions is critical for obtaining the desired compression in experiments. Shock velocities and post-shock conditions are determined by laser-energy deposition, heat conduction, and equations of state. This paper describes experiments at the National Ignition Facility (NIF) where multiple shocks are launched into a cone-in-shell target made of polystyrene, using laser pulse shapes with two or three pickets and varying on-target intensities. Shocks are diagnosed using the Velocity Interferometric System for Any Reflector diagnostic. Simulated and inferred shock velocities agree well for the range of intensities studied in this work. These results are the first shock-velocity measurements using direct drive on the NIF and provide a good measure of early-time, directly driven laser-energy coupling. Furthermore, the validated models add to the credibility of direct-drive-ignition designs at the megajoule scale.

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Research Organization:: University of Rochester, NY (United States)

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

Grant/Contract Number:: NA0004144; AC52-07NA27344

OSTI ID:: 2352265

Journal Information:: Physical Review. E, Journal Name: Physical Review. E Journal Issue: 4 Vol. 109; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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