Abstract
Hexanitrostilbene (HNS) is a booster explosive that is usually applied to exploding foil initiators (EFIs) properly in HNS-IV form. The initiation process of HNS-IV explosive or EFI is very difficult to observe due to its small scale and rapid reaction. The interface particle velocity profiles were used to indicate the shock compression and reaction process in this paper. The interface particle velocities between HNS-IV explosive and LiF window were measured using an available Photonic Doppler Velocimetry (PDV). The experiment could get the CJ point correctly for its strong signal, so that the velocity peak infers CJ point in the paper. The experimental results show that the detonation pressure of HNS-IV grows quite rapid relatively. The peak pressure is 15.0 GPa at 0.51 mm thickness, which indicates a fast detonation build-up process. The peak pressure is 17.7 GPa at 1.48 mm thickness, which nearly reaches the steady detonation pressure. To allow practical estimations of detonation properties, the ignition and growth parameters for HNS-IV were developed by comparing the interface particle velocities between the experiments and calculations.
