Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Poster: Atomic clusters (with MO)

A 11.6: Poster

Montag, 23. März 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)