Heidelberg 2015 – scientific programme
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A: Fachverband Atomphysik
A 11: Poster: Atomic clusters (with MO)
A 11.6: Poster
Monday, March 23, 2015, 17:00–19:00, C/Foyer
Time-resolved X-ray Imaging of Anisotropic Nanoplasma Expansion — •Christian Peltz1, Charles Varin2, Thomas Brabec2, and Thomas Fennel1 — 1Institute of Physics, University of Rostock, Germany — 2Department of Physics and Centre for Photonics Research,University of Ottawa, Canada
We investigate the time-dependent evolution of laser-heated R = 25 nm solid-density hydrogen clusters via coherent diffractive imaging for an infrared pump / x-ray probe scenario. Our microscopic particle-in-cell analysis provides a full self-consistent electromagnetic description of both the droplet ionization and expansion induced by the intense few-cycle pump pulse as well as the elastic and inelastic light scattering by the x-ray probe in the expanding nano-plasma [1]. Our analysis reveals that continuous ion ablation on the cluster surface 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. Our findings suggest, that time-resolved diffractive imaging experiments on nano-droplets will provide unprecedented insights into the physics of ion expansion and surface ablation in laser-driven plasmas [2].
[1] C. Varin, C. Peltz, T. Brabec and T. Fennel , Phys. Rev. Lett. 108, 175007 (2012)
[2] C. Peltz, C. Varin, T. Brabec and T. Fennel , Phys. Rev. Lett. 113, 133401 (2014)