Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Atomic clusters (with MO)

A 2.1: Hauptvortrag

Montag, 23. März 2015, 11:30–12:00, M/HS1

Dynamic x-ray imaging of clusters in strong fields — •Thomas Fennel — University of Rostock, 18051, Rostock, Germany

Intense laser-cluster interactions allow the fundamental investigation of collective and correlated processes in nanoscale plasmas, including ionization avalanching, plasmon-assisted electron acceleration, attosecond plasma wave dynamics, and plasma expansion. With the rapidly developing capabilities of FELs, novel routes to the direct time-resolved imaging of the underlying dynamics are emerging [1]. I will discuss the feasibility of pump - probe scattering experiments for tracing cluster dynamics via diffractive imaging with (sub?)femtosecond resolution. The recently developed microscopic particle-in-cell approach (MicPIC) accounts simultaneously for both the correlated (classical) atomic scale plasma dynamics and electromagnetic wave propagation [2]. Complete MicPIC simulations of NIR pump - x-ray probe experiments on Hydrogen clusters are used to (i) identify relevant signatures in the scattering images and to (ii) benchmark a simplified reconstruction scheme to retrieve the (ultra)fast evolution of the cluster density profile [3]. The results suggest the potential to illuminate the dynamics of laser ablation and anisotropic plasma expansion with unprecedented detail. An outlook on routes to attosecond-resolved diffractive imaging and sub-cycle photonic streaking via inelastic x-ray scattering will be given.

[1] I. Barke et al., Nat. Commun. (accepted)

[2] C. Varin et al., Phys. Rev. Lett. 108, 175007 (2012)

[3] C. Peltz et al., Phys. Rev. Lett 113, 133401 (2014)