Study of the gaspuff line mass and density from Laval nozzle

The gas puff is one of the main loads used in Z pinch research. In this paper the basic physics process of the Laval nozzle on Qiangguang I generator is analyzed using one dimension isentropic gas dynamics equation.The Mach number 4.6 of the gas flow is calculated and corrected as 3.5 considering the effect of boundary. Combining the data of gas puff Z pinch experiments on Qiangguang I generator, the expression of the line mass is obtained using the implosion time expression which is deduced from snowplow model. In the end of the paper the distribution of the gas density is given by the BollisticTransport (B-T) model and the gas density is between 10１６/cm３ and １０１７／cm３. Along the axis within 2 cm, a hollow gas shell structure is formed．