在喷气Z-pinch内爆等离子体研究中,雪铲模型是一种常用的、比较简单的物理模型.根据实验中提供的电流波形,负载线质量和初始半径,可以通过雪铲模型来估算内爆到心的时刻.根据一维运动方程和不同构形下的解析解以及部分实验结果相结合,讨论了雪铲模型的适用范围.数值计算的内爆时间和实验(Gamble II,Double-EAGLE,BLACKJACK 5)测量值符合得较好.结果表明,雪铲模型在喷气Z-pinch实验的负载优化设计研究中是很有参考价值的方法.

In gas-puff Z-pinch experiments,the snowplow model,one of the simplest and commonly used models,has been used to predict the implosion time from the generator current parameters,the load mass per unit length,and initial radius of annular gas load.After analyzing the physical model,the one-dimensional motion equation and it's solutions in different configuration of the annular gas column are discussed in this paper.According to these formulas,the calculated Z-pinch imploding time arriving at the certer are compared with the values of the three typical experiments(on Gamble Ⅱ,Double-EAGLE and BLACKJACK5 respectively) with current 1.21～3.0MA.The comparison shows that the snowplow model is a tool in prediction of some experimental results to optimize the load parameters like the slug model in wire array Z-pinch experiments.