J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 963-966
Time-resolved X-ray spectra of hot & dense plasmas from laser-clusters interactionF. 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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