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P: Fachverband Plasmaphysik
P 14: Miscellaneous
P 14.5: Vortrag
Mittwoch, 10. März 2010, 17:30–17:45, B 302
X-Ray Thomson Scattering from warm dense carbon isochorically heated by laser-generated protons — •Alexander Pelka1, Mark Günther1, Knut Harres1, Anke Otten1, Markus Roth1, Gabriel Schaumann1, Anna Tauschwitz2, Gianluca Gregori3, Dirk Gericke4, Siegfried Glenzer5, Andrea Kritcher5, and Marius Schollmeier6 — 1Technische Universität Darmstadt — 2Gesellschaft für Schwerionenforschung, Darmstadt — 3University of Oxford — 4University of Warwick — 5Lawrence Livermore National Laboratory, Livermore — 6Sandia National Laboratory, Albuquerque
We demonstrate X-ray Thomson Scattering from warm, dense, volumetrically heated matter. An intense, ultrashort proton beam, generated by a high-intensity short-pulse laser via Target Normal Sheath Acceleration is used to heat a carbon sample to temperatures of a few thousand Kelvin. A second short pulse laser is then used to generate a short-lived (several 10 ps) bright source of 4.75 keV Ti He-alpha radiation for x-ray scattering. The scattered photons are detected with a spectrometer using a curved HOPG crystal in von Hamos geometry positioned at 90∘. Due to the exponential energy distribution of the protons and the resulting depth dependency of the temperature a relatively wide range of temperatures up to 0.4 eV at constant densities could be accessed. Both the duration of heating and scattering are short compared to hydrodynamic processes in the target, allowing expansion to be neglected. The presented method allows the investigation of the EOS of isochorically heated carbon near its melting point.