Abstract
X-ray diagnostics of the interaction of femtosecond laser pulses with intensities of 1016–1018 W/cm2 with CO2 clusters and frozen nanosize water particles is carried out. The stage of cluster expansion and the formation of a plasma channel, which governs the parameters of the formed X-ray radiation source and accelerated ion flows, is studied. The measurements are based on recording spatially resolved X-ray spectra of H- and He-like oxygen ions. Utilization of Rydberg transitions for spectra diagnostics makes it possible to determine plasma parameters on a time scale of t ∼ 10 ps after the beginning of a femtosecond pulse. The role of the rear edge of the laser pulse in sustaining the plasma temperature at a level of ∼100 eV in the stage of a nonadiabatic cluster expansion is shown. The analysis of the profiles and relative intensities of spectral lines allows one to determine the temperature and density of plasma electrons and distinguish the populations of “thermal” ions and ions that are accelerated up to energies of a few tens of kiloelectronvolts. It is shown that the use of solid clusters made of frozen nanoscale water droplets as targets leads to a substantial increase in the number of fast He-like ions. In this case, however, the efficiency of acceleration of H-like ions does not increase, because the time of their ionization in plasma exceeds the time of cluster expansion.
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Original Russian Text © I.Yu. Skobelev, A.Ya. Faenov, S.V. Gasilov, T.A. Pikuz, S.A. Pikuz Jr., A.I. Magunov, A.S. Boldarev, V.A. Gasilov 2009, published in Prikladnaya Fizika, 2009, No. 3, pp. 58–67.
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Skobelev, I.Y., Faenov, A.Y., Gasilov, S.V. et al. Diagnostics of plasma produced by femtosecond laser pulse impact upon a target with an internal nanostructure. Plasma Phys. Rep. 36, 1261–1268 (2010). https://doi.org/10.1134/S1063780X10130283
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DOI: https://doi.org/10.1134/S1063780X10130283