Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Laser Plasmas I
P 20.5: Vortrag
Mittwoch, 4. März 2015, 15:15–15:30, HZO 30
Heating and Ionization Dynamics in Solid Density Plasmas Driven by Ultra-short Relativistic Lasers — •Lingen Huang1, Thomas Kluge1, Michael Bussmann1, and Thomas Cowan1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, D-01328 Dresden, Germany — 2Technische Universität Dresden, D-01062 Dresden, Germany
The dynamics of heating and ionization, which determines the crucial plasma parameters such as temperature, free electron density and so on, is one of the fundamental issues in the realm of ultra-short relativistic laser-solid target interactions. We present our work on investigation of heating and ionization dynamics in solid copper target irradiated by ultra-short intense laser pulse using two dimensional particle-in-cell simulations. The simulation results show that the bulk electron temperature is very sensitive to the initial preplasma scale length. By varying the preplasma scale length from 0 to 0.08 micrometer, the bulk electron temperatures in the interest of region increase from ~26 eV to ~109 eV, which agrees very well with the theory based on Ohmic heating mechanism by treating the return current correctly. The bulk electron heating is finally translated into bulk ionization, which leads to the average Cu ion charge state increasing from ~4.3 to ~10.7.