Abstract
Simulations of the gas flow inside the IFMIF-DONES vacuum system were performed with Molflow+. The IFMIF-DONES model is based on the last IFMIF/EVEDA design and of the LIPAc accelerator, which is being built for testing IFMIF accelerator components. Both, LIPAc and IFMIF-DONES share the same type of accelerator subsystems. The model was prepared for simulation by adding different sets of boundary conditions for the pumping of deuterium and hydrogen originating from beam losses and outgassing, respectively. A model of the lithium target was set up to study the lithium condensation at beamline components.The simulations of metal layer deposition in the vacuum system show no degradation of the vacuum performance. The simulations of the gas pumping show pressure profiles which are mainly determined by the beam losses in this subsystem. In general, the pressure profiles of the different subsystems are nearly independent from each other due to the small apertures installed between the subsystems.
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