Bremen 2017 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 5: Laseranwendungen und Laserstrahlwechselwirkung III
K 5.3: Vortrag
Mittwoch, 15. März 2017, 09:55–10:15, GW2 B2890
Thermalization of X-ray-generated electron cascades in diamond and LiF — •Vladimir Lipp1, Nikita Medvedev2, and Beata Ziaja-Motyka1,3 — 1CFEL at DESY, Hamburg, Germany — 2Institute of Physics and Institute of Plasma Physics, Academy of Science of Czech Republic, Prague, Czech Republic — 3Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
Optical materials, such as diamond [1] and LiF [2], already for a long time serve as high-quality detectors of X-ray irradiation. Recent XFEL experiments show that LiF can provide in situ 3D visualization of the beam profile thanks to laser-generated color centers [3]. However, even for low-fluence X-ray pulses, the material response is significantly influenced by the secondary electron cascades. In this talk, we discuss the kinetics of the laser-excited electron cascades as predicted with our classical Monte-Carlo simulations, based on the improved XCASCADE code. These simulations take into account the creation of laser-excited hot electrons and their elastic and inelastic collisions with ions. The model delivers full temporal and spatial characteristics of the electron trajectories in various materials, including diamond and LiF. Our calculated electron range shows a reasonable agreement with the corresponding experimental [3] and theoretical [4] results.
[1] A. De Sio et al., Spectrochim. Acta B 62, 558 (2007)
[2] G. Baldacchini et al., Rev. Sci. Instrum. 76, 113104 (2005)
[3] T. Pikuz et al., Scientific Reports 5, 17713 (2015).
[4] B. Ziaja et al., J. Appl. Phys. 97, 064905 (2005).