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Laser-driven ablation through fast electrons in PALS experiment
Gus'kov, S. Yu. ; Chodukowski, T. ; Demchenko, N. ; Kalinowska, Z. ; Kasperczuk, A. ; Krouský, Eduard ; Pfeifer, Miroslav ; Pisarczyk, P. ; Pisarczyk, T. ; Renner, Oldřich ; Skála, Jiří ; Šmíd, Michal ; Ullschmied, Jiří
Energy transfer to shock wave in Al and Cu targets irradiated by a laser pulse with intensity of I~1-50 PW/cm2 and duration of 250 ps was investigated at Prague Asterix Laser System (PALS). The iodine laser provided energy in the range of 100-600 J at the first and third harmonic frequencies. The focal spot radius of laser beam on the target was varied from 160 to 40 µm. The dominant contribution of fast electron energy transfer into the ablation process was found when using the first harmonic radiation, the focal spot radius of 40-100 µm, and the energy of 300-600 J. The fast electron heating results in the growth of ablation pressure from 60 Mbar at the intensity of 10 PW/cm2 to 180 Mbar at the intensity of 50 PW/cm2 and in the growth of the efficiency of the energy conversion into the shock wave from 2 to 7 % under the conditions of 2D ablation.
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PALS - status and selected results
Ullschmied, Jiří
The PALS iodine terawatt laser system has been successfully serving both domestic and foreign researchers for already the third year, representing thus an important part the network of large European lasers.The PALS research activities in the period 2000-2002 are summarized in the paper, and its present technical capabilities and prospects of their further development are described.
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