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

On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

by Dr Mikhail M. Basko (GSI, Darmstadt; on leave from KIAM, Moscow)

Europe/Berlin
Seminarraum Theorie (GSI Darmstadt)

Seminarraum Theorie

GSI Darmstadt

Description
The effect of strong thermal radiation on the structure of quasi-stationary laser ablation fronts is investigated under the assumption that all the laser flux is absorbed at the critical surface. Special attention is paid to adequate formulation of the boundary-value problem for a steady-state planar ablation flow. The dependence of the laser-to-x-ray conversion efficiency r on the laser intensity IL and wavelength L is analyzed within the non-equilibrium diffusion approximation for radiation transfer. The scaling of the main ablation parameters with IL and L in the strongly radiative regime 1-r << 1 is derived. It is demonstrated that strongly radiating ablation fronts develop a characteristic extended cushion of “radiation-soaked” plasma between the condensed ablated material and the critical surface, which can efficiently suppress perturbations from the instabilities at the critical surface.