Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Laser Plasmas I

P 20.6: Vortrag

Mittwoch, 4. März 2015, 15:30–15:45, HZO 30

Investigation of Warm Dense Carbon in the 100-200 GPa regime — •Jan Helfrich¹, Simon Frydrych¹, Gabriel Schaumann¹, Benjamin Barbrel², Jan Vorberger³, Dirk Gericke⁴, Benjamin Bachmann⁵, Luke Fletcher⁶, Eliseo Gamboa⁶, Sebastian Göde⁶, Maxence Gauthier⁶, Eduardo Granados⁶, Hae Ja Lee⁶, Bob Nagler⁶, Alessandra Ravasio⁶, William Schumaker⁶, Tilo Döppner⁵, Roger Falcone², Siegfried Glenzer⁶, Dominik Kraus², and Markus Roth¹ — ¹TU Darmstadt IKP, Germany — ²UC Berkley, USA — ³MPIPKS Dresden, Germany — ⁴University of Warwick, UK — ⁵LLNL Livermore, USA — ⁶SLAC, Menlo Park, USA

The behavior of carbon under high pressure and high temperature are important for inertial confinement fusion (ICF). For fusion experiments samples with solid state densities traverses the Warm Dense Matter (WDM) region to reach the plasma state. In ICF, the ablator always contains carbon and one of the problems there is the re-freezing of the ablator carbon layer after the first shock. For the investigation of this high-pressure solid-liquid transition we used angle resolved X-ray scattering and a laser-driven shock wave to reach the WDM conditions. We compressed three different types of graphite to reach different final states with pressures up to 200 GPa. By comparing the scattering contributions from elastic to inelastic scattering we are able to determine the ion-ion structure factor. We are able to measure the ion-ion structure factor for k-values from 4.1e10 to 6.1e10 1/m. The measurements are agreed wit ab-initio DFT quantum simulations.