Heidelberg 2015 – wissenschaftliches Programm
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 . 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 . 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 . 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.
 I. Barke et al., Nat. Commun. (accepted)
 C. Varin et al., Phys. Rev. Lett. 108, 175007 (2012)
 C. Peltz et al., Phys. Rev. Lett 113, 133401 (2014)