Measuring the shock impedance mismatch between high-density carbon and deuterium at the National Ignition Facility

Fine-grained diamond, or high-density carbon (HDC), is being used as an ablator for inertial confinement fusion (ICF) research at the National Ignition Facility (NIF). Accurate equation of state (EOS) knowledge over a wide range of phase space is critical in the design and analysis of integrated ICF...

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Bibliographic Details
Published in:Physical review. B 2018-04, Vol.97 (14), Article 144108
Main Authors: Millot, M., Celliers, P. M., Sterne, P. A., Benedict, L. X., Correa, A. A., Hamel, S., Ali, S. J., Baker, K. L., Berzak Hopkins, L. F., Biener, J., Collins, G. W., Coppari, F., Divol, L., Fernandez-Panella, A., Fratanduono, D. E., Haan, S. W., Le Pape, S., Meezan, N. B., Moore, A. S., Moody, J. D., Ralph, J. E., Ross, J. S., Rygg, J. R., Thomas, C., Turnbull, D. P., Wild, C., Eggert, J. H.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Ablation
Carbon
Computer simulation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density
Deuterium
Diamonds
Equations of state
Experiments
Ignition
Impedance
Implosions
Inertial confinement fusion
Tables (data)
Velocimetry
Velocity measurement
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Summary:Fine-grained diamond, or high-density carbon (HDC), is being used as an ablator for inertial confinement fusion (ICF) research at the National Ignition Facility (NIF). Accurate equation of state (EOS) knowledge over a wide range of phase space is critical in the design and analysis of integrated ICF experiments. Here, we report shock and release measurements of the shock impedance mismatch between HDC and liquid deuterium conducted during shock-timing experiments having a first shock in the ablator ranging between 8 and 14 Mbar. Using ultrafast Doppler imaging velocimetry to track the leading shock front, we characterize the shock velocity discontinuity upon the arrival of the shock at the HDC/liquid deuterium interface. Comparing the experimental data with tabular EOS models used to simulate integrated ICF experiments indicates the need for an improved multiphase EOS model for HDC in order to achieve a significant increase in neutron yield in indirect-driven ICF implosions with HDC ablators.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.144108