Abstract
This paper presents a study of the distribution of plasma facing unit fixation for the CFETR (China Fusion Engineering Test Reactor) water-cooled divertor. The divertor development activity started in 2017 using the ITER-like divertor PFU (Plasma Facing Unit) scheme for the preliminary design phase. In this paper the impact of the distribution of the PFU fixings in the divertor has been studied and a first design assessment and optimization has been carried out in order to determine the best distribution for CFETR. Seven different fixation distributions of divertor target PFU were analyzed under stationary thermal loads. The results shown that fixation distribution has limited influence over the maximum stress on armor but significantly affects the stress on the heat sink tube and fixation attachments. The optimal fixation method significantly reduces the thermal stress in PFUs and passes a electromagnetic load check.
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