Direct-drive cylindrical target compression at Shenguang-Ⅱ laser facility

An experiment of direct-drive cylindrical target compression is carried out using the eight laser beams of Shenguang-Ⅱ laser facility with the spots defocused to 200 m. A clear flow diagram of cylindrical target implosion is obtained with Mo backlight driven by the 9th laser beam and Kirkpatrick-Baez microscopy. Experimental result shows that, for the cylindrical target with an outer diameter of 260 m, a compressed density of up to 120 times the initial density is obtained, which is between the densities of electron production area and energy deposition area. Experiments of electron beam transport and energy deposition in this compressed cylindrical target could be carried out once the Shenguang-Ⅱ ps laser beam is available.