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K: Fachverband Kurzzeitphysik
K 4: Lasersysteme und deren Anwendungen II
K 4.3: Talk
Tuesday, March 3, 2015, 14:40–15:00, HZO 40
Femtosecond probing of fast transient plasma processes in high-power laser interaction with solids — •Thomas Kluge1, Lingen Huang1, Christian Gutt2, Michael Bussmann1, Hyun Chung3, Malte Zacharias1, Ulrich Schramm4, and Thomas Cowan4 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Universität Siegen — 3International Atomic Energy Agency — 4Helmholtz-Zentrum Dresden-Rossendorf und TU Dresden
Ultra-intense laser-matter interactions are a major research area in in modern plasma physics. One of the essential elements is the relativistic electron generation and transport dynamics. At present, a predictive understanding of high-intensity laser-matter interactions is severely hampered by the lack of self-consistent models for the ionization dynamics, coupled with the complex electron transport.
We establish the feasibility of using XFEL femtosecond X-ray sources to probe the spatial correlations inside of the solid-density plasma using small angle X-ray scattering (SAXS) and resonant SAXS, to obtain for the first time information on the spatial and temporal evolution of the electron density and ionization dynamics with few fs and few nm resolution. The local and instantaneous ionization state can be measured when the X-ray beam is tuned to a bound-bound resonance of a particular charge state. The atomic scattering factor at the threshold of core electron excitation increases for example at Kα excitations in highly ionized Cu to a magnitude of more than 100 times the Thomson cross section per ion.