Simultaneous diagnosis of radial profiles and mix in NIF ignition-scale implosions via X-ray spectroscopy

Ciricosta, O.; Scott, H.; Durey, P.; Hammel, B. A.; Epstein, R.; Preston, T. R.; Regan, S. P.; Vinko, S. M.; Woolsey, N. C.; Wark, J. S.

doi:10.1063/1.5000774

Title: Simultaneous diagnosis of radial profiles and mix in NIF ignition-scale implosions via X-ray spectroscopy

Journal Article · Mon Nov 06 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5000774· OSTI ID:1438689

Ciricosta, O. ^[1]; Scott, H. ^[2]; Durey, P. ^[3]; Hammel, B. A. ^[2];

^[4]; Preston, T. R. ^[1]; Regan, S. P. ^[4]; Vinko, S. M. ^[1];

^[3]; Wark, J. S. ^[1]

Univ. of Oxford (United Kingdom). Dept. of Physics. Clarendon Lab.
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of York (United Kingdom). Dept. of Physics
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

In a National Ignition Facility implosion, hydrodynamic instabilities may cause the cold material from the imploding shell to be injected into the hot-spot (hot-spot mix), enhancing the radiative and conductive losses, which in turn may lead to a quenching of the ignition process. The bound-bound features of the spectrum emitted by high-Z ablator dopants that get mixed into the hot-spot have been previously used to infer the total amount of mixed mass; however, the typical errorbars are larger than the maximum tolerable mix. We present in this paper an improved 2D model for mix spectroscopy which can be used to retrieve information on both the amount of mixed mass and the full imploded plasma profile. By performing radiation transfer and simultaneously fitting all of the features exhibited by the spectra, we are able to constrain self-consistently the effect of the opacity of the external layers of the target on the emission, thus improving the accuracy of the inferred mixed mass. The model's predictive capabilities are first validated by fitting simulated spectra arising from fully characterized hydrodynamic simulations, and then, the model is applied to previously published experimental results, providing values of mix mass in agreement with previous estimates. Finally, we show that the new self consistent procedure leads to better constrained estimates of mix and also provides insight into the sensitivity of the hot-spot spectroscopy to the spatial properties of the imploded capsule, such as the in-flight aspect ratio of the cold fuel surrounding the hotspot.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States); Univ. of Oxford (United Kingdom); Univ. of York (United Kingdom)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); New York State Energy Research and Development Authority (NYSERDA) (United States); Engineering and Physical Sciences Research Council (EPSRC); Royal Society (United Kingdom)

Grant/Contract Number:: AC52-07NA27344; NA0001944; EP/L000849/1; EP/L000644/1; EP/H035877/1

OSTI ID:: 1438689

Alternate ID(s):: OSTI ID: 1407434

Report Number(s):: LLNL-JRNL-736521; TRN: US1900487

Journal Information:: Physics of Plasmas, Vol. 24, Issue 11; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Cited By (4)

Fluorescence and absorption spectroscopy for warm dense matter studies and ICF plasma diagnostics Hansen, S. B.; Harding, E. C.; Knapp, P. F. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5018580	journal	May 2018
Deep learning: A guide for practitioners in the physical sciences Spears, Brian K.; Brase, James; Bremer, Peer-Timo Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5020791	journal	August 2018
X-ray spectroscopy of planar laser-plasma interaction experiments at the National Ignition Facility Rosenberg, M. J.; Epstein, R.; Solodov, A. A. Physics of Plasmas, Vol. 26, Issue 1 https://doi.org/10.1063/1.5074191	journal	January 2019
Interpreting the electron temperature inferred from x-ray continuum emission for direct-drive inertial confinement fusion implosions on OMEGA Cao, D.; Shah, R. C.; Regan, S. P. Physics of Plasmas, Vol. 26, Issue 8 https://doi.org/10.1063/1.5112759	journal	August 2019

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