Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range

Journal Article · Mon Mar 19 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5020422· OSTI ID:1457361

Aglitskiy, Y. ^[1]; Velikovich, A. L.  ^[1]; Karasik, M. ^[1]; Schmitt, A. J. ^[1]; Serlin, V. ^[1]; Weaver, J. L.  ^[1]; Oh, J.  ^[1]; Obenschain, S. P. ^[1]; Cochrane, K. R. ^[2]

---

1. Naval Research Lab., Washington, D.C. (United States)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Absolute Hugoniot measurements for empty plastic foams at ~10% of solid polystyrene density and supporting rad-hydro simulation results are reported. Planar foam slabs, ~400 μm thick and ~500 μm wide, some of which were covered with a 10 μm solid plastic ablator, were directly driven by 4 ns long Nike krypton-fluoride 248 nm wavelength laser pulses that produced strong shock waves in the foam. The shock and mass velocities in our experiments were up to 104 km/s and 84 km/s, respectively, and the shock pressures up to ~9 Mbar. The motion of the shock and ablation fronts was recorded using side-on monochromatic x-ray imaging radiography. Here, the steadiness of the observed shock and ablation fronts within ~1% has been verified. The Hugoniot data inferred from our velocity measurements agree with the predictions of the SESAME and CALEOS equation-of-state models near the highest pressure ~9 Mbar and density compression ratio ~5. In the lower pressure range 2–5 Mbar, a lower shock density compression is observed than that predicted by the models. Possible causes for this discrepancy are discussed.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1457361
• Alternate ID(s): OSTI ID: 1426845
• Report Number(s): SAND-2017-13815J; 659683; TRN: US1901368
• Journal Information: Physics of Plasmas, Vol. 25, Issue 3; ISSN 1070-664X
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English