First radiative shock experiments on the SG-Ⅱ laser

作者：Francisco Suzuki-Vidal; Thomas Clayson; Chantal Stehlé; Uddhab Chaulagain; Jack W.D.Halliday; Mingying Sun; Lei Ren; Ning Kang; Huiya Liu; Baoqiang Zhu; Jianqiang Zhu; Carolina De Almeida Rossi; Teodora Mihailescu; Pedro Velarde; Manuel Cotelo; John M.Foster; Colin N.Danson; Christopher Spindloe; Jeremy P.Chittenden; Carolyn Kuranz

来源：High Power Laser Science and Engineering, 2021, 9(02): 198-205.

We report on the design and first results from experiments looking at the formation of radiative shocks on the Shenguang-Ⅱ(SG-Ⅱ) laser at the Shanghai Institute of Optics and Fine Mechanics in China.Laser-heating of a two-layer CH/CH-Br foil drives a～40 km/s shock inside a gas cell filled with argon at an initial pressure of 1 bar.The use of gas-cell targets with large(several millimetres) lateral and axial extent allows the shock to propagate freely without any wall interactions,and permits a large field of view to image single and colliding counter-propagating shocks with time-resolved,pointprojection X-ray backlighting(～20 μm source size,4.3 keV photon energy).Single shocks were imaged up to 100 ns after the onset of the laser drive,allowing to probe the growth of spatial nonuniformities in the shock apex.These results are compared with experiments looking at counter-propagating shocks,showing a symmetric drive that leads to a collision and stagnation from～40 ns onward.We present a preliminary comparison with numerical simulations with the radiation hydrodynamics code ARWEN,which provides expected plasma parameters for the design of future experiments in this facility.