Speaker
Description
In recent years, a Volumetric Neutron Source (VNS) has been developed within EUROfusion with the aim of first demonstrating feasibility and then designing a machine that would reduce risk for the successful operation of teh demonstration fusion power plant DEMO. This would be achieved by designing and constructing a facility where crucial nuclear technologies, such as the tritium breeding blanket, can be tested and validated. The VNS is envisaged as a beam-driven, modestly sized tokamak which, due to its limited size, would be relatively quick to build, reasonably priced, and have tritium consumption low enough that it can be supplied by external sources, while still providing test conditions close to those expected in fusion power plants.
One of the challenges in integrating various systems is the lower port, where multiple functions must be consolidated into a design that meets all design requirements and limits. In this presentation, we describe our work on neutronics analyses in the area of the divertor and lower port. The focus was on reducing neutron-induced helium production in the divertor cooling pipes and investigating nuclear loads in the vacuum vessel below the divertor. The effect of introducing different shielding materials into the divertor and neighboring components was examined, and the impact of openings and gaps was quantified.
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