KAERI laser facility for high energy density plasma research

摘要

Summary form only given. The 1 kJ Nd:Glass laser at KAERI has symmetrically irradiated a SiO2 shell from tetrahedral direction for uniform compression of a spherical target since August 2015. A spherical target chamber with turning mirrors, focusing lenses and monitoring instrument was installed to generate a high density laser-plasma by irradiating four laser beams. A X-ray multi-pin holes camera and a X-ray spectrometer were mainly used to determine plasma parameters of a SiO2 shell target. Si+131s-2p (Lyα) and Si+121s2-1s2p spectrum lines from the X-ray spectrometer were used to determine plasma parameters. The electron temperature and the electron density of a compressed micro-balloon target were estimated T~140 eV and ne~3.4×1022/cm3 respectively based on the Boltzmann plot and Stark broadening, Nomarski interferometer and VISAR were also used to investigate ablated plasma parameters and a velocity of a shockwave.