Numerical study of Kα X-ray emission from multi-layered cold and compressed targets irradiated by ultra-short laser pulses

International Conference on Atomic and Nuclear Physics

November 17-18, 2016 Atlanta, USA

Hamed Koochaki Kelardeh

Georgia State University, USA

Posters & Accepted Abstracts: J Astrophys Aerospace Technol

Abstract :

The generation of K�± X-ray produced by interaction of ultra-short laser pulses with metal targets has been studied numerically. The focusing of an ultra-intense laser beam on a solid target produces plasma on its surface. Hot electrons are generated via collective absorption mechanisms, such as resonant absorption (RA) or vacuum heating (VH). While the less energetic electrons deposit their energy in a thin front layer resulting in strong heating, the more energetic electrons penetrate much further into the target up to the colder regions behind the hot plasma where they ionize the k-shell of the atoms giving rise to the emission of "cold" K�± photons. Using Maxwell Boltzmann distribution function for hot electron and applying an analytical model, the number of K�± photons were calculated as a function of hot electron temperature, target thickness and K-shell ionization cross section. Also, simulation results of K�± yield versus target thickness variations from two and three layer metals have been presented. These calculations are useful for optimization of X-ray yield produced by irradiation of metal targets with high intensity laser pulses. Since the electrons are generated only during the interaction with the laser pulse, a very short K�± pulse of the order of the laser pulse duration is expected. The short duration makes these x-ray pulses very attractive for probing the dynamics of matter on the femto-second scale. Moreover, because of its small X-ray spot size, it has a number of interesting applications for medical imaging techniques.

Biography :

Email: hamedtu@gmail.com