Abstract
This paper presents an update of the network simulation of the ITER torus vacuum system on the basis of the 2012 design of the ITER divertor. The focus of the simulation work is given to the torus exhaust pumping during plasma pulses, which was studied at three typical divertor pressures. Furthermore, simulations were performed for the pumping at dwell phase between pulses. The model was built in ITERVAC which is a software for smooth simulation of the mass flow through ducts at isothermal conditions in a wide flow regime. The results show for the burn phase a very strong back streaming of gas into the plasma, mainly caused by the flows in the gaps between the cassettes. For the dwell phase, the pump-down time can be significantly reduced, if all six cryopumps are utilized.
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