In a MW-scale neutron scattering facility coupled with a high-intensity proton accelerator, proton beam window is installed as the boundary between a high vacuum region of the proton beam transport line and a helium environment around the target assembly working as a neutron source. The window is cooled by water so as to remove high volumetric heat generated by the proton beam. A concept of the flat-type proton beam window consisting of two plates of 3mm thick was proposed, which was found to be feasible under the proton beam power of 5MW through thermal-hydraulic and structural strength analyses.
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