53rd Annual Meeting of the APS Division of Plasma Physics
Volume 56, Number 16
Monday–Friday, November 14–18, 2011;
Salt Lake City, Utah
Session TI3: HEDP and Laboratory Astrophysics
9:30 AM–12:30 PM,
Thursday, November 17, 2011
Room: Ballroom AC
Chair: Carolyn Kuranz, University of Michigan
Abstract ID: BAPS.2011.DPP.TI3.4
Abstract: TI3.00004 : Dynamic compression of water to 700 GPa: single- and double shock experiments on Sandia's Z machine, first principles simulations, and structure of water planets
11:00 AM–11:30 AM
Preview Abstract
Abstract
Author:
Thomas R. Mattsson
(Sandia National Laboratories, Albuquerque, NM 87185, USA)
Significant progress has over the last few years been made in
high energy density physics (HEDP) by executing high-precision
multi-Mbar experiments and performing first-principles
simulations for elements ranging from carbon [1] to xenon [2].
The properties of water under HEDP conditions are of particular
importance in planetary science due to the existence of
ice-giants like Neptune and Uranus. Modeling the two planets, as
well as water-rich exoplanets, requires knowing the equation of
state (EOS), the pressure as a function of density and
temperature, of water with high accuracy. Although extensive
density functional theory (DFT) simulations have been performed
for water under planetary conditions [3] experimental validation
has been lacking. Accessing thermodynamic states along planetary
isentropes in dynamic compression experiments is challenging
because the principal Hugoniot follows a significantly different
path in the phase diagram. In this talk, we present experimental
data for dynamic compression of water up to 700 GPa, including in
a regime of the phase-diagram intersected by the Neptune
isentrope and water-rich models for the exoplanet GJ436b. The
data was obtained on the Z-accelerator at Sandia National
Laboratories by performing magnetically accelerated flyer plate
impact experiments measuring both the shock and re-shock in the
sample. The high accuracy makes it possible for the data to be
used for detailed model validation: the results validate first
principles based thermodynamics as a reliable foundation for
planetary modeling and confirm the fine effect of including
nuclear quantum effects on the shock pressure.
Sandia National Laboratories is a multiprogram laboratory managed
and operated by Sandia Corporation, a wholly owned subsidiary
of Lockheed Martin Corporation, for the U.S. Department of
Energy's National Nuclear Security Administration under Contract
No. DE-AC04-94AL85000.
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[1] M.D. Knudson, D.H. Dolan, and M.P. Desjarlais, SCIENCE 322,
1822 (2008).\\[0pt]
[2] S. Root, et al., Phys. Rev. Lett. 105, 085501 (2010).\\[0pt]
[3] M. French, et al., Phys. Rev. B 79, 054107 (2009).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DPP.TI3.4