铝单丝在可调预脉冲作用下的Z箍缩动力学行为实验和数值模拟研究
摘要
<p indent="0mm">The implosion characteristics of preconditioned aluminum single-wire Z-pinch under different pre-main pulse intervals are studied based on the double-pulse Z-pinch experimental platform “Qin-1” facility to study the effect of prepulse current on the dynamic behavior of Z-pinch implosion. The prepulse current heats and vaporizes the aluminum wire, forming the core-coronal structure, which then expands. The snow plow then implodes under the main pulse current. Secondly, based on the magneto fluid model, the density, temperature, and velocity distributions for the prepulse current and the implosion shell distributions for the main pulse current are calculated. The calculated results’ boundary trajectory is generally consistent with the experimental measurement. The dynamic behavior of a preconditioned single-wire Z-pinch can be divided into four stages: corona plasma expansion, corona plasma implosion, core and coronal plasma implosion, and stagnation. Lorentz force works on the outer layer of the coronal plasma, and thermal pressure works inside the snow-plow implosion shell of undisturbed plasma to accumulate plasma under the snow-plow implosion.