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Hybrid Vlasov-Fokker-Planck-Maxwell simulations of fast electron transport and the time dependance of K-shell excitation in a mid-Z metallic target

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number015017
<mark>Journal publication date</mark>22/01/2013
<mark>Journal</mark>New Journal of Physics
Number of pages20
Publication StatusPublished
<mark>Original language</mark>English


Using a hybrid Vlasov-Fokker-Planck-Maxwell code coupled to calculations using a modified relativistic binary-encounter Bethe model of ionizing collisions we study the time and space dependence of K-alpha photon generation by a fast electron beam injected into a solid density copper plasma target. The electron beam is chosen to be representative of that expected to be generated by a picosecond duration, similar to 10(19) W cm(-2) intensity laser. K-alpha photons are produced as electrons reflux laterally across the target and are slowed and thermalized by collisions with, and Ohmic heating of, the background fluid over a similar to 10 ps timescale, which dictates the timescale for K-alpha emission. The results show reasonable agreement with recent experimental results in terms of both the yield and time dependance. We show how lateral expansion of the electrons can be imaged in the K-alpha radiation.