Measurement of mix at the fuel–ablator interface in indirectly driven capsule implosions on the National Ignition Facility

Hall, G. N.; Weber, C. R.; Smalyuk, V. A.; Landen, O. L.; Trosseille, C.; Pak, A.; Hartouni, E.; Marley, E.; Ebert, T.; Bradley, D. K.; Hsing, W.; Tommasini, R.; Izumi, N.; Pape, S. Le; Divol, L.; Krauland, C. M.; Thompson, N.; Casco, E. R.; Ayers, M. J.; Nagel, S. R.; Carpenter, A. C.; Hurd, E. R.; Dayton, M. S.; Engelhorn, K.; Holder, J. P.

doi:10.1063/5.0171617

Measurement of mix at the fuel–ablator interface in indirectly driven capsule implosions on the National Ignition Facility

Journal Article · Thu Feb 15 00:00:00 EST 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0171617· OSTI ID:2567914

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The interface between the capsule ablator and fuel ice layer is susceptible to hydrodynamic instabilities. The subsequent mixing of hot ablator material into the ice reduces fuel compression at stagnation and is a candidate for reduced capsule performance. The ability to diagnose ice–ablator mix is critical to understanding and improving stability at this interface. Combining the crystal backlighter imager with the single line of sight camera on the National Ignition Facility (NIF) allows direct measurement of ice–ablator mix by providing multiple quasi-monochromatic radiographs of layered capsule implosions per experiment with high spatial (∼12 μm) and temporal (∼35 ps) resolution. The narrow bandwidth of this diagnostic platform allows radiography of the inner edge of the capsule limb close to stagnation without capsule self-emission contaminating the data and removes opacity uncertainties typically associated with the spectral content of the radiograph. Analysis of radiographic data via a parameterized forward-fitting Abel inversion technique provides measurements of the distribution of mix mass inwards from the ice–ablator interface. The sensitivity of this mix measurement technique was demonstrated by applying it to layered experiments in which the stability of the ice–ablator interface was expected to vary significantly. Additional experiments suggest that high-density carbon capsules that employ a buried-layer dopant profile suffer from mixing at the innermost doped–undoped interface. Data from these experiments suggest that opacity models used in hydrodynamic simulations of NIF experiments can potentially over-predict the opacity of doped capsules. LLNL-JRNL-850535-DRAFT.

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

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2567914

Alternate ID(s):: OSTI ID: 2350888

Report Number(s):: LLNL-JRNL-850535; 022702

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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