Abstract
Divertor, whose main functions are to sustain extremely high heat load and to exhaust impurity, is a key component in fusion reactor. CFETR divertor is currently under engineering design and technical validation phase. In this study, a cooling circuit design is proposed to obtain sufficient heat removal capability for CFETR divertor. The cooling circuit consists of two main modules which are outer target module and inner target module. Considering the complexity of the parallel cooling circuit concept, hydraulic characteristics is assessed and optimized for enough heat transfer capability and critical heat flux margin. Assessment of the hydraulic characteristics for the cooling circuit is performed by investigating flow velocity and local pressure on channels’ cross-sections. Uniform flow velocity of 10 m/s and acceptable critical heat flux margin higher than 1.4 in PFU coolants channels are obtained after optimization meeting the design requirements of the divertor.
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