Phase transition of tin under ramp compression

In this paper, the phase transition experiments of tin were done under magnetically driven quasi-isentropic compression technology on the facility CQ-4,which is capable to deliver a current of peak of 4 MA within rise time of 470 $\sim$ 600ns. As shown in Figure 1, the loading pressure P produced by large pulsed current J interaction with the self-inducing magnetic field B acts on the surfaces of electrodes of electrode panels. Simulation of one dimensional dynamic process with MEOS (multiphase~equation of state) phase transition model is done. The simulation input is a stress loading history boundary of surfaces of electrode panels, and the stress is calculated by the plate/window interface velocity. Since the plate/window interface velocity doesn't have the information of the rarefaction wave reflection between the sample and window, the process can only simulate the loading stage now.