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Abstract

The basic scheme: irradiating laser beam, solid plexiglass target and (Asterix III) iodine laser beam. Two cases were investigated: i) "out of focus" experiment with a 450 mum diameter of the irradiated area and a laser intensity of 1.4 x 10**14 W cm**-2, ii) "in focus" experiment with an 85 mum diameter of the irradiated area and a laser intensity of 3 x 10**15 W cm**-2. The shock front motion can be measured and compared with calculated shock wave trajectories: In the "out of focus" experiment it remains approximately planar for 10**-8 s. 1-D computer simulations agree quantitatively with the experiments and suggest a peak pressure of 6 Mbar during laser irradiation. The "in focus" experiments at 3 x 10**15 Wcm**-2 on a 85 mum diameter focal spot were simulated with the two-dimensional Eulerian MAGT code, (quasi-Lagrangian rezoning). A study about the influence of three parameters on the shock wave trajectory was made: i) equation of state; ii) diameter of the area of energy deposition; iii) and effective absorbed energy. The input data were the same as those used previously for simulation of thin foil acceleration experiments. Good agreement in both cases suggests that a quantitative prediction of laser-induced hydrodynamic motion is possible with such hydrocodes. For the nominal "in focus" conditions the code calculations give a peak pressure of 50 Mbar.

Additional information

Authors: SCHMALZ R F, MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY);UNIVERSITY OF ALBERTA, EDMONTON (CANADA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA);SIGEL R, MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY);UNIVERSITY OF ALBERTA, EDMONTON (CANADA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA);FEDOSEJEVS R, MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY);UNIVERSITY OF ALBERTA, EDMONTON (CANADA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA);TENG YUNG LU MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY);UNIVERSITY OF ALBERTA, EDMONTON (CANADA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA);UNIVERSITY OF ALBERTA, EDMONTON (CANADA), MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY);UNIVERSITY OF ALBERTA, EDMONTON (CANADA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA), MAX-PLANCK-INSTITUT FUER QUANTENOPTIK, GARCHING BEI MUENCHEN (GERMANY);UNIVERSITY OF ALBERTA, EDMONTON (CANADA);SHANGHAI INSTITUTE OF LASER TECHNOLOGY, SHANGHAI (CHINA)
Bibliographic Reference: FOURTH APS CONFERENCE ON SHOCK WAVES IN CONDENSED MATTER, SPOKANE, WASHINGTON (USA), JULY 22-25, 1985 PUBLISHED IN SHOCK WAVES IN CONDENSED MATTER, 1986, PP. 535-539 PUBLISHED BY PLENUM PUBLISHING CORPORATION, NEW YORK (USA)
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