Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Poster Session I
A 25.23: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Time-resolved X-ray Imaging of Anisotropic Nanoplasma Expansion — •Christian Peltz1, Christoph Bostedt2, Mathias Kling3, Thomas Brabec4, Eckart Rühl5, Artem Rudenko6, Tais Gorkhover7, and Thomas Fennel1 — 1Institute of Physics, University of Rostock, Germany — 2Argonne National Laboratory, Argonne, USA — 3Faculty of Physics, LMU Munich, Germany — 4Department of Physics and Centre for Photonics Research, University of Ottawa, Canada — 5Physical Chemistry, FU Berlin, Germany — 6Department of Physics, Kansas-State University, USA — 7LCLS, SLAC National Accelerator Laboratory, Menlo Park, USA
We investigate the time-dependent evolution of laser-heated solid-density nanoparticles via coherent diffractive x-ray imaging, theoretically and experimentally. Our microscopic particle-in-cell calculations for R = 25 nm hydrogen clusters reveal that infrared laser excitation induces continuous ion ablation on the cluster surface. This process generates an anisotropic nanoplasma expansion that can be accurately described by a simple self-similar radial density profile. It’s time evolution can be reconstructed precisely by fitting the time-resolved scattering images using a simplified scattering model in Born approximation [1]. Here we present the first successful high resolution reconstruction of corresponding experimental results, obtained at the LCLS facility with SiO2 nanoparticles (D=120 nm), and compare them to the theoretical predictions.
[1] C. Peltz, C. Varin, T. Brabec and T. Fennel , Phys. Rev. Lett. 113, 133401 (2014)