Laser-driven ablation through fast electrons in PALS experiment

8th International Conference on Inertial Fusion Sciences and Applications

Gus'Kov, S. Yu^1 ; Chodukowski, T.^2 ; Demchenko, N.^1 ; Kalinowska, Z.^2 ; Kasperczuk, A.^2 ; Krousky, E.^3 ; Pfeifer, M.^3 ; Pisarczyk, P.^4 ; Pisarczyk, T.^2 ; Renner, O.^3 ; Skala, J.^3 ; Smid, M.^3 ; Ullschmied, J.^5

P.N.Lebedev Physical Institute of RAS, Leninskii pr. 53, Moscow

119991, Russia^1

Institute of Plasma Physics and Laser Microfusion, 23 Hery St., Warsaw

00-908, Poland^2

Institute of Physics ASCR, V.v.i., Na Slovance 2, Prague

182 21-8, Czech Republic^3

Warsaw University of Technology, ICS, 15/19 Nowowiejska St., Warsaw

00-665, Poland^4

Institute of Plasma Physics ASCR, V.v.i., Za Slovankou 3, Prague

182 008, Czech Republic^5

关键词: Ablation pressure;    Dominant contributions;    Fast electrons;    First harmonic;    Focal spot;    Iodine lasers;    Prague asterix laser systems;    Third-harmonic frequencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012023/pdf
DOI  :  10.1088/1742-6596/688/1/012023

来源: IOP

【 摘 要 】

Energy transfer to shock wave in Al and Cu targets irradiated by a laser pulse with intensity of I≈1-50 PW/cm2and duration of 250 ps was investigated at Prague Asterix Laser System (PALS). The iodine laser provided energy in the range of 100-600 J at the first and third harmonic frequencies. The focal spot radius of laser beam on the target was varied from 160 to 40 μm. The dominant contribution of fast electron energy transfer into the ablation process was found when using the first harmonic radiation, the focal spot radius of 40-100 μm, and the energy of 300-600 J. The fast electron heating results in the growth of ablation pressure from 60 Mbar at the intensity of 10 PW/cm2to 180 Mbar at the intensity of 50 PW/cm2and in the growth of the efficiency of the energy conversion into the shock wave from 2 to 7% under the conditions of 2D ablation.