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Open Access Publications from the University of California

Absolute Equation-of-State Measurement for Polystyrene from 25 to 60 Mbar Using a Spherically Converging Shock Wave

  • Author(s): Doeppner, T.
  • Swift, D.C.
  • Kritcher, A.L.
  • Bachmann, B.
  • Collins, G.W.
  • Chapman, D.A.
  • Hawreliak, J.
  • Kraus, D.
  • Nilsen, J.
  • Rothman, S.
  • Benedict, L.X.
  • Dewald, E.
  • Fratanduono, D.E.
  • Gaffney, J.A.
  • Glenzer, S.H.
  • Hamel, S.
  • Landen, O.L.
  • Lee, H.J.
  • LePape, S.
  • Ma, T.
  • MacDonald, M.J.
  • MacPhee, A.G.
  • Milathianaki, D.
  • Millot, M.
  • Neumayer, P.
  • Sterne, P.A.
  • Tommasini, R.
  • Falcone, R.W.
  • et al.

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We have developed an experimental platform for the National Ignition Facility that uses spherically converging shock waves for absolute equation-of-state (EOS) measurements along the principal Hugoniot. In this Letter, we present one indirect-drive implosion experiment with a polystyrene sample that employs radiographic compression measurements over a range of shock pressures reaching up to 60 Mbar (6 TPa). This significantly exceeds previously published results obtained on the Nova laser [R. Cauble et al., Phys. Rev. Lett. 80, 1248 (1998)] at a strongly improved precision, allowing us to discriminate between different EOS models. We find excellent agreement with Kohn-Sham density-functional-theory-based molecular dynamics simulations.

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