Emission and reemission properties of gold double-disk targets heated by laser

A new kind of double-disk gold targets were irradiated by 0.35 mum intense laser and the properties of improved X-ray spectra were investigated at "Xi ngguang" laser facilities. Collision velocities between the primary and sec ondary disks' plasmas have been measured. This double-disk target's design has avoided the influence of the spraying plasma from primary disk to a cer tain extent, and increased the "clearance" for ablated secondary disk. Two soft X-ray spectrometers were used to measure X-ray radiation from the prim ary and secondary disks, respectively. An X-ray streaked camera was used to obtain time-spactial images emitted from laser-plasma of double-disks targ ets. Experimental results were analyzed physically.