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In the FAIR project which is currently in progress,we foresee a serious dynamic vacuum problem at the plasma physics terminal.When the intense pulsed ion beam induced plasma target evaporates,the pressure in the target chamber will go from nano-bar up to probably the magnitude of milli-bar.This will destroy the ultra-high vacuum in the whole accelerator system if no proper pumps or apertures are designed.Therefore,the simulation of the whole process including the plasma target evaporation as well as the following vacuum change along the beam line is necessary to provide some information for the terminal construction.