J. Phys. IV France
Volume 133, June 2006
Page(s) 963 - 966
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 963-966

DOI: 10.1051/jp4:2006133193

Time-resolved X-ray spectra of hot & dense plasmas from laser-clusters interaction

F. Dorchies, C. Bonté, F. Blasco, T. Caillaud, R. Fedosejevs, C. Fourment, M. Harmand, O. Peyrusse, J.J. Santos and J. Stevefelt

CELIA, UMR 5107, CNRS - CEA, Université Bordeaux I, 33405 Talence, France

Interaction of femtosecond (30 fs - 5 ps) and intense (up to 1017 W/cm2) laser pulses with Ar clusters (180 to 350 Å radius) has been studied. The laser absorption and the cluster heating have been measured using different diagnostics, demonstrating the production of very hot and dense plasmas, in the keV range. A special attention has been devoted to the K-shell x-ray emission spectra (2.9-3.3 keV). X-ray emission has been observed from ions in very high charge states (Ar16 + ). Time-resolved measurements have been performed, giving evidence, for the first time, of extremely short x-ray pulses (<3 ps). Simulations based on both an hydrodynamic model and collisional-radiative atomic physics reveal an extremely brief x-ray emission burst (down to the sub-picosecond) consistent with measurements.

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