Laser ablation propulsion and hypervelocity impacts are developing areas of research. This work aims to understand the contribution of different laser and target parameters to the momentum transfer during laser ablation through ballistic
pendulum experiments. The data presented are the results of three experimental campaigns using different pulse durations, wavelengths and energies. The momentum was calculated from Photonic Doppler Velocimetry (PDV) and pendulum deflection measurements, while the contribution of the ejecta was estimated by camera imaging. The experimental results were complemented by 1D simulations of the momentum and ejecta contribution using the ESTHER code.
A 100 J DiPOLE amplifier with the capability to have arbitrary pulse shaping has been successful installed at XFEL Hamburg for High Energy Density Physics. We have demonstrated 70 J at 1 Hz and has been delivered to the target chamber for experiment using frequency doubled energy at 60% efficiency. During the experimental period the system was run for 24 hours over a period of seven days.
D. Javorkova, P. Neumayer, Th. Kühl, S. Borneis, E. Brambrink, C. Bruske, E. Gaul, S. Götte, T. Hahn, H. Heuck, S. Kunzer, T. Merz, D. Reemts, M. Roth, F. Schrader, A. Tauschwitz, R. Thiel, D. Ursescu, P. Wiewior, B. Zielbauer
With PHELIX (Petawatt High Energy Laser for heavy Ion EXperiments) a high energy/ultra-high intensity
laser system is currently under construction at the GSI (Gesellschaft für SchwerIonenforschung, Germany). In
combination with the high current high energy ion accelerator facility this will provide worldwide unique experimental
opportunities in the field of dense plasma physics and inertial fusion research. In the long pulse mode the laser system
will provide laser pulses of up to 5 kJ in 1-10 ns pulses. In the high intensity mode pulse powers in excess of 1 PW will
be achieved. For this the well known technique of chirped pulse amplification (CPA) will be implemented. A new CPA
stretcher-compressor setup for the PHELIX laser was calculated and designed. A 4-pass single-grating stretcher and
a 4-pass single-grating test compressor, both with a full transmission bandwidth of 16 nm, as well as the compact
single-pass compressor for the final pulse compression will be presented. Spatial chirp and spectral phase aberrations of
the stretcher were optimized. We discuss the dependence of critical alignment tolerances on the angle of incidence and
show the effects on the temporal pulse shape.
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