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“Materials under extreme compression, as the one achieved by direct laser illumination, exhibit almost-equal thermal and Coulomb energies and structural properties that are in between those of ideal gases and solids. Their understanding is critical for the calculation of the equation-of-state of the interior of giant planets as well as for inertial confinement fusion research. We will show that x-ray scattering can be used to extract static correlation properties for both the ionic and electronic subsystems. So far, dynamics properties have been limited to the electrons only, however, with the advent of 4th generation light sources there will be new possibilities to directly access ion-acoustic dynamics, as well as exotic electron-positron states relevant to high energy laboratory astrophysics.
Here we will summarize a few examples drawn from experiments conducted in low-Z materials using high power lasers. We will also discuss novel hybrid analytical techniques to model the full dynamical response of warm dense matter.”
Short bio: “Dr Gregori got his Ms in Astrophysics and PhD in Mechanical Engineering both at the University of Minnesota, Minneapolis (US) in 2001. He then worked as a post-doctoral associate in the NIF directorate at the Lawrence Livermore National Laboratory (LLNL) where he has developed x-ray scattering diagnostics for inertial confinement fusion research. From 2003-2005 he was appointed staff scientist at LLNL in the fast ignitor group. In 2005 Dr Gregori was appointed senior scientist to the Rutherford Appleton Laboratory (UK) and in 2007 he become lecturer in the Physics Department at Oxford University. He is affiliated with Lady Margaret Hall where he teaches 2nd and 3rd year physics students. Dr Gregori research activities are concentrated on warm dense matter, new generation light sources and applications of high intensity lasers for fusion research and laboratory astrophysics.”