Hot Electron Diagnostic in a Solid Laser Target by Buried K-Shell Fluorer Technique from Ultra-Intense (3x1020W/cm2,< 500 J) Laser-Plasma Interactions on the Petawatt Laser at LLNL

Yasuike, K. ; Key, M.H. ; Hatchett, S.P. ; Snavely, R.A.

Lawrence Livermore National Laboratory

关键词: Laser Targets;    46 Instrumentation Related To Nuclear Science And Technology;    K Shell;    Lasers;    Emission Spectra;   

DOI  :  10.2172/802613
RP-ID  :  UCRL-ID-139612
RP-ID  :  W-7405-Eng-48
RP-ID  :  802613

美国|英语

来源: UNT Digital Library

【 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 {micro}m laser light with an intensity of up to 3 x 10{sup 20}W cm{sup -2} and an on target laser energy of {le}500 J, has been done by observing K{sub {beta}} as well as K{sub {alpha}} 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 ({le} 4 x 10{sup 19} Wcm{sup -2} and {le} 30 J). The conversion efficiency from the laser energy into the energy, carried by hot electrons, has been estimated to be {approx}50%, which are little bit higher than the previous less laser energy ({approx} 20 J) experiments, yet the x-ray emission spectra from the target has change drastically, i.e., gamma flash.