Enhanced Bremsstrahlung Emission in Intense Laser-Cluster Interactions

POSTER

Abstract

What dynamics ensues when a sub-picosecond, 248 nm, pulse of laser light interacts with a xenon cluster of 10-10$^{4}$ atoms at intensities $>$10$^{19}$ W/cm$^{2}$? Measurements in such experiments are difficult to make. However, in them [1], two features stood out. One, a 2 mm long, 1-3 $\mu $m diameter channel of self-focused laser light was formed, and two, amplification of $\approx $2.8 {\AA} x-radiation along the channel was observed. A model that would generate the population inversions needed to produce the observed amplifications was recently constructed [2]. It assumed that inner-shell n=2 holes were being generated through inner-shell photoionizations that came about through bremsstrahlung emissions that were being greatly enhanced in the presence of intense laser fields ($>$10$^{19}$ W/cm$^{2})$. In this talk, we present results from quantum electrodynamics calculations [3] that support the production of such enhancements.\\[4pt] [1] Borisov A. B., \textit{et. al.}, J. Phys. B, \textbf{41},105602 (2008). [2] Petrova Tz. B., \textit{et. al.}, J. Phys. B, \textbf{43}, 025601 (2010); \textbf{44}, 125601 (2011). [3] Lebed A. A. and Roshchupkin S. P., Phys. Rev. A, \textbf{81}, 033413 (2010).

Authors

  • Kenneth Whitney

    Berkeley Research Assoc. 6551 Mid Cities Ave., Beltsville, MD 20705, USA, Berkeley Research Assoc., 6551 Mid Cities Ave., Beltsville, MD 20705, USA

  • Tzvetelina Petrova

    Plasma Physics Division, Naval Research Laboratory 4555 Overlook Ave. SW, Washington. DC 20375, USA, Radiation Hydrodynamics Branch, Plasma Physics Division, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375, USA, Plasma Physics Division, Naval Research Laboratory 4555 Overlook Ave. SW, Washington DC 20375, USA

  • Jack Davis

    Plasma Physics Division, Naval Research Laboratory 4555 Overlook Ave. SW, Washington. DC 20375, USA, Radiation Hydrodynamics Branch, Plasma Physics Division, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375, USA, Plasma Physics Division, Naval Research Laboratory 4555 Overlook Ave. SW, Washington DC 20375, USA

  • G. Petrov

    Plasma Physics Division, Naval Research Laboratory 4555 Overlook Ave. SW, Washington. DC 20375, USA, Radiation Hydrodynamics Branch, Plasma Physics Division, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375, USA, Plasma Physics Division, Naval Research Laboratory 4555 Overlook Ave. SW, Washington DC 20375, USA, NRL