Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 8: Laser Plasmas I

P 8.7: Talk

Tuesday, March 1, 2016, 16:15–16:30, b302

Ionization Dynamics in Intense Ultrashort Laser-Jet Interaction — •Mohammed Shihab^1,2, Thomas Bornath¹, and Ronald Redmer¹ — ¹Institut für Physik, Universität Rostock — ²Physics Department, Tanta University, Egypt

Warm dense matter (WDM) is located between the cold solid state and hot ideal plasmas. The treatment of strong correlations and quantum effects is crucial for WDM states. Knowledge of the equation of state of WDM is important for the modeling of giant planets, shock-wave experiments, and inertial confinement fusion experiments. New free-electron lasers such as FLASH and XFEL (Hamburg) and LCLS (Standford) enable pump-probe experiments in order to study WDM. For instance, an intense ultrashort laser pulse (pump) heats cryogenic targets isochorically and generates WDM. Then a probe pulse provides an X-ray Thomson scattering spectrum and consequently the properties of the target can be infered [1]. In this contribution we study the interaction of intense and ultrashort laser pulses (800 nm) with neutral He jets utilizing 2d/3v electromagnetic Particle-in-Cell simulation (XOOPIC) [2]. The goal is to find the optimum laser parameters and the optimum initial condition of the target to prepare the desired WDM phase. We demonstrate the effect of kinetic instabilities and of the localized nonlinear electromagnetic waves on the laser energy delivered to the target and on the Thomson scattering signal. This study was supported by the DFG within the SFB 652 and by the BMBF within the FSP 302. [1] Glenzer and Redmer, Rev. Mod. Phys. 81, 1625(2009). [2] Verboncoeur et al, Comp. Phys. Comm. 87, 199(1995).