Spatially resolved analysis of K alpha x-ray emission from plasmas induced by a femtosecond weakly relativistic laser pulse at various polarizations

Year: 2013

Authors: Cristoforetti G., Anania M.P., Faenov A.Y., Giulietti A., Giulietti D., Hansen S.B., Koester P., Labate L., Levato T., Pikuz T.A., Gizzi LA.

Autors Affiliation: Intense Laser Irradiation Laboratory (ILIL), INO-CNR, Via G.Moruzzi 1, 56124 Pisa, Italy; Quantum Beams Science Directorate, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215, Japan and High Temperatures of Russian Academy of Sciences, Izhorskaja Street 13/19, Moscow, Russia; Department of Physics “E.Fermi\”, University of Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy; INFN, Pisa Section, Largo B. Pontecorvo 3, 56127 Pisa, Italy; Sandia National Laboratories, Albuquerque, NM 87123, USA

Abstract: Spatially resolved K-shell spectroscopy is used here to investigate the interaction of an ultrashort laser pulse (lambda = 800 nm, tau = 40 fs) with a Ti foil under intense irradiation (I lambda(2) = 2 x 10(18) W mu m(2) cm(-2)) and the following fast electron generation and transport into the target. The effect of laser pulse polarization (p, s, and circular) on the K alpha yield and line shape is probed. The radial structure of intensity and width of the lines, obtained by a discretized Abel deconvolution algorithm, suggests an annular distribution of both the hot electron propagation into the target and the target temperature. An accurate modeling of K alpha line shapes was performed, revealing temperature gradients, going from a few eV up to 15-20 eV, depending on the pulse polarization. Results are discussed in terms of mechanisms of hot electron generation and of their transport through the preplasma in front of the target. DOI: 10.1103/PhysRevE.87.023103


Volume: 87 (2)      Pages from: 023103  to: 023103

More Information: This work was partially funded by the HiPER programme and by the MIUR-PRIN 2009 \”Fusione a confinamento inerziale via laser […].\” A.Y.F. and T. A. P. were funded by INFN FAI funds for participation in the experimental campaign at ILIL laboratory.
DOI: 10.1103/PhysRevE.87.023103

Citations: 11
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