Radiation Characteristics of Nested Wire Array Implosions in Sino-Russian Joint Z-Pinch Experiments on Angara-5-1

X-ray radiation characteristics of nested wire array implosions were investigated in the Sino-Russian joint Z-Pinch experiments on Angara-5-1 facility with a load current of 2.5 ~ 3.6 MA. The experimental results indicate that an X-ray power-platform prior to the main peak and a less intensive sub-peak after the main peak in the X-ray power waveform exist for the nested wire array implosions, and the radiation process is relatively faster than that in the case of single array. Laser shadowgraph of the imploding plasma suggests that the prior power-platform is a result of the collision of the inner-outer plasma layers. The faster radiation process of nested array implosion can be explained by analysing the corresponding result of the time-resolved one-dimensional imaging system, which demonstrates a better axial imploding uniformity and synchronization. The sub-peak after the main peak is proposed to be a result of the later-time additional implosion of plasma.