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Tuesday 19 December 2017, 2F

Colloquium Dr. Vladimir Lipp (CFEL)

"Spatial and temporal evolution of X-ray-induced electron cascades in solids" by Dr. Vladimir Lipp (CFEL)

Date: Tuesday December 19th 2017

Time : 11:00 

Location : Hal B, 2F

Hosted by Prof. Dr. Fred Bijkerk (The Industrial Focus Group XUV Optics /TNW).

Vladimir Lipp (1986) graduated from Moscow Engineering Physics Institute (State University) in Russia with specialty "Applied Mathematics and Physics" in 2009. Then he started working on his PhD at the University of Kaiserslautern, Germany; continued at Fraunhofer Institute for Laser Technology (ILT), Aachen, Germany; and finished at the University of Kassel, Germany in 2015. The title of his thesis is "Atomistic-continuum modeling of ultrafast laser-induced melting of silicon targets". After a short postdoctoral work in Kassel, in 2016 he got a postdoctoral position at the Center for Free-Electron-Laser Science (CFEL), DESY, Hamburg. He is applying continuum modeling, classical molecular dynamics, Monte Carlo, Tight Binding, and ab initio simulations to study the effects of optical and XUV lasers on various materials. 

Spatial and temporal evolution of X-ray-induced electron cascades in solids

Low-fluence X-ray irradiation excites hot electrons within the target and triggers secondary electron cascades. In this talk, I discuss the kinetics of the X-ray-excited electron cascades as predicted with our in-house classical Monte-Carlo simulation tool Xcascade-3D [1]. The simulations take into account the excitation of hot electrons and their anisotropic elastic and inelastic collisions with ions. The model delivers full temporal and spatial characteristics of the electron trajectories in various materials, consisting of elements with atomic numbers 1 - 92. The calculated electron ranges in silicon and gold are in a good agreement with the available data, confirming the potential for high accuracy applications, such as study of material damage and X-ray pulse diagnostics.

 [1] V. Lipp, N. Medvedev, B. Ziaja, Proc. SPIE 10236, 102360H (2017)