PALS laser-driven radiative jets for astrophysical and ICF applications

Details PALS laser-driven radiative jets for astrophysical and ICF applications PALS laser-driven radiative jets for astrophysical and ICF applications

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..993..315p&link_type=abstract

PLASMA 2007: International Conference on Research and Applications of Plasmas; 4th German-Polish Conference on Plasma Diagnostic

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Applications

Laser-Beam Impact Phenomena, Shock Waves And Discontinuities, Plasma Heating By Microwaves, Ecr, Lh, Collisional Heating

Scientific paper

High speed, well-collimated plasma jets were generated in the interaction of defocused single laser beam with planar, massive Cu target. The experiment was carried out at the iodine laser facility (Prague Asterix Laser System-PALS) using the third harmonic beam (0.438 μm) with a pulse duration of 250 ps (FWHM) and an energy of 100 J. The information about geometry of plasma expansion, plasma dynamics and electron density were obtained by means of a 3-frame interferometric system. The plasma jet parameters reach the following values: the velocity up to 7×107 cm/s, the internal Mach number greater than 10 and the electron density above 1019 cm-3. The jet characteristics are appropriate for the astrophysical and ICF applications. To ensure the interaction of this jet with gas or plasma as an ambient medium, a high-pressure supersonic gas nozzle was used, which created a cylindrical column of Ar or He. The results of first experiments dedicated to studies of collision of such a jet with a gas cloud are also presented. They clearly show the effect of shocks formation in ambient gases (He and Ar) due to the jet action. In the case of He the shock waves have usually a conical shape with a thickness of 1-1.5 mm, whereas in the case of Ar, the shock wave configuration is more complex and its thickness is less than 1 mm.

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