During the academic semesters the plasma physics department hosts seminars on Tuesday at 2:30 pm.
If you have questions or want to suggest a speaker/topic, please contact Prof. Olga Rosmej or Dr. Paul Neumayer.

Plasmaphysik Seminar

X-ray spectroscopy and atomic physics in laser heated Warm Dense Matter

by Michal Šmíd (HZDR)

Room 96629963798 (Zoom)

Room 96629963798


Zoom-Meeting https://gsi-fair.zoom.us/j/96629963798 Meeting-ID: 966 2996 3798 Kenncode: 130302

Warm Dense Matter (WDM) is a transitional state between solid and ideal plasmas. It can contain highly charged ions and moderate electron temperatures, while retaining rest of crystalline-like structure. In experimental conditions it can be typically created in a dynamical way by irradiation of solid targets with ultra-short pulse lasers. The x-ray spectroscopy of plasma is a great way of studying this transitional state of matter, by using either a broadband x-ray beam as a backlighter for absorption measurement, or self-emission to observe the radiation of various charge states of present ions.

In this talk I will present two different experiments studying warm dense Copper with their results and a minimum of underlying theory. In the first case, the matter is heated by direct irradiation by optical laser (Draco, Dresden), and probed variable delay later by a 'Laser wakefield accelerated' (LWFA) betatron beam. From the x-ray absorption techniques we can infer both the electron and ion temperatures, therefore observing the heating and melting of the material. In the second case, the matter is created ('pumped') and probed simultaneously by the same pulse of the X-ray Free Electron Laser (European XFEL, Hamburg). Moderately charged ions are created within the duration of the pulse (~30 fs) and their Kα emission is stimulated by the beam. The self-emission spectra in this well described environment serves as a road map of various atomic transitions and non-equilibrium atomic-physics effects of those ions.


Meeting-ID: 966 2996 3798
Kenncode: 130302


Organized by

Olga Rosmej