Robert Paddock
(Department of Physics, Clarendon Laboratory, University of Oxford, UK)
Wetted-foam layers are of significant interest for ICF capsules, due to the unprecedented control they provide over the convergence ratio of the implosion, and the opportunity this affords to minimize hydrodynamic instability growth. However, the equation of state (EOS) for fusion relevant foams is not well characterized, and many simulations therefore rely on modelling such foams as a homogeneous medium of the foam average density. The accuracy of this hypothesis is not known with great confidence. To address this question, an experiment was performed in January 2022 using the VULCAN Laser at the Central Laser Facility. The aim was to measure the EOS of TMPTA foams at 260 mg/cc, corresponding to the density of DT-wetted-foam layers relevant to ICF research. Such a foam would be also be directly relevant for recently proposed ‘hydrodynamic equivalent’ capsules. VISAR was used to measure the shock velocity of both the foam and a quartz reference layer, while streaked optical pyrometry was used to measure the temperature of the shocked material. Preliminary results suggest that, for the 20 – 120 GPa pressure range accessed, this material can indeed be well described using the equation of state of the homogeneous medium at the foam density.
Artem Martynenko
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
Bruno Albertazzi
(LULI, CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France)
Dr
Daniel Eakins
(Department of Engineering Science, University of Oxford, UK)
Dr
David Chapman
(Department of Engineering Science, University of Oxford, UK)
Fabrizio Consoli
(ENEA)
Dr
John Pasley
(York Plasma Institute, Department of Physics, University of York, U.K)
Mr
Leonard Wegert
(GSI Helmholtzzentrum für Schwerionenforschung, Germany )
Dr
Marko Von der Leyen
(Department of Physics, Clarendon Laboratory, University of Oxford, UK)
Dr
Matthew Oliver
(Central Laser Facility, STFC, Rutherford Appleton Laboratory, Didcot, UK)
Mattia Cipriani
(ENEA - CR Frascati)
Prof.
Michel Koenig
(LULI, CNRS, CEA, Ecole Polytechnique, UPMC, Univ Paris 06: Sorbonne Universites, France )
Dr
Paul Mabey
(Freie Universität Berlin, Germany )
Dr
Paul Neumayer
(GSI Helmholtzzentrum für Schwerionenforschung, Germany )
Prof.
Peter Norreys
(Department of Physics, Clarendon Laboratory, University of Oxford, UK)
Piotr Raczka
(IPPLM)
Mr
Przemyslaw Tchorz
(Institute of Plasma Physics and Laser Microfusion, Poland)
Dr
Rami Aboushelbaya
(Department of Physics, Clarendon Laboratory, University of Oxford, UK)
Dr
Robbie Scott
(Central Laser Facility, STFC, Rutherford Appleton Laboratory, Didcot, UK)
Robert Paddock
(Department of Physics, Clarendon Laboratory, University of Oxford, UK)
Dr
Warren Garbett
(AWE plc, Aldermaston, Reading, UK)
