Measurement of the Precursor Gas Accompanied with the Launch of Two-Stage Gas Gun

During the launch of hypervelocity projectile in the two-stage light gas gun, the remanent gas in target chamber and the pushing gas that leaks through the projectile might disturb the physical measurement of target sample. In this paper quartz gauges were used to detect whether the influence of such gases is in existence and how much it is. Our results show that the precursor gas exists indeed accompanied with the shoot of two-stage light gas gun, but its pressure is only about 10-2 GPa in amplitude and could not produce obvious influence to the usual high pressure experiments.