Hot Electron Diagnostic in a Solid Laser Target by Buried K-Shell Fluorer Technique from Ultra-Intense (3x10(20)W/cm(2), less than or equal to 500 J) Laser-Plasma Interactions on the Petawatt Laser at LLNL.

摘要

Characterization of hot electron production (a conversion efficiency from laser energy into electrons) in ultra intense laser-solid target interaction, using 1.06 micrometers laser light with an intensity of up to 3 times 10 to the 20th power W cm-2 and an on target laser energy of less than or equal to 500 J, has been done by observing K beta as well as Kalpha, emissions from a buried Mo layer in the targets, which are same structure as in the previous 100 TW experiments but done under less laser intensity and energy conditions (less than or equal to 4 X 10 to the 19th power Wcm-2 and less than or equal to 30 J). The conversion efficiency from the laser energy into the energy, carried by hot electrons, has been estimated to be approximately 50 %, which are little bit higher than the previous less laser energy (approximately 20 J) experiments, yet the x-ray emission spectra from the target has change drastically, i.e., gamma flash.