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Electromagnetic pulses produced by expanding laser - produced Au plasma

100%

De Marco M. , Cikhardt J. , Krása J. , Velyhan A. , Pfeifer M. , Krouský E. , Klír D. , Řezáč D. , Limpouch J. , Margarone D. , Ullschmied J.

tom Vol. 60, No. 2

239--243

The interaction of an intense laser pulse with a solid target produces large number of fast free electrons. This emission gives rise to two distinct sources of the electromagnetic pulse (EMP): the pulsed return current through the holder of the target and the out flow of electrons into the vacuum. A relation between the characteristics of laser-produced plasma, the target return current and the EMP emission are presented in the case of a massive Au target irradiated with the intensity of up to 3 × 1016 W/cm2. The emission of the EMP was recorded using a 12 cm diameter Moebius loop antennas, and the target return current was measured using a new type of inductive target probe (T-probe). The simultaneous use of the inductive target probe and the Moebius loop antenna represents a new useful way of diagnosing the laser–matter interaction, which was employed to distinguish between laser-generated ion sources driven by low and high contrast laser pulses.

Experimental and theoretical investigations of crater formation in an aluminium target in a PALS experiment

88%

Borodziuk S. , Doskach I. , Gus'kov S. , Jungwirth K. , Kálal M. , Kasperczuk A. , Kralikova B. , Krousky E. , Limpouch J. , Masek K. , Pfeifer M. , Pisarczyk P. , Pisarczyk T. , Rohlena K. , Rozanov V. , Skala J. , Ullschmied J.

tom Vol. 49, nr 1

7-14

Experimental and theoretical results of investigations of the iodine laser - Al solid target interactions on the PALS (Prague Asterix Laser System) facility are presented. The experimental investigations of laser interaction with massive Al targets devoted to shock wave propagation in solids and crater formation physics are presented. Experiments were performed with the use of high intensity laser pulses (1013 15 W/cm2) for two laser wavelengths (0.438 mi m and 1.315 mi m) and four laser beam radii (from 35 mi m up to 600 ěm). The crater dimensions were measured using optical microscopy and a wax-replica technique. Plasma expansion out of the target was measured via three-frame interferometry. Theoretical model of the postpulse crater formation by the shock wave propagating and decaying in solids after the end of the laser pulse is presented and applied for the explanation of the results obtained in experiments.