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Report No.

TEF beam window design and evaluation of structural integrity

Obayashi, Hironari; Takei, Hayanori ; Wan, T.; Kogawa, Hiroyuki; Iwamoto, Hiroki ; Sasa, Toshinobu

The objective of this study is to evaluate the feasibility of a designed target beam window (BW) of J-PARC Transmutation Experimental Facility by the numerical analysis with a 3D model. In the typical case, the peak current density and the profile of the proton beam were set to 20 $$mu$$A/cm$$^{2}$$ and a Gaussian shape, respectively. The flow rate of Lead Bismuth Eutectic (LBE) coolant and temperature at the inlet were 1 l/sec and 350 $$^{circ}$$C. In this case, the maximum velocity of LBE and the maximum temperature appeared at the top of the BW were about 1.2 m/sec and 477 $$^{circ}$$C. The maximum shear stress was 190 MPa, which was observed at the center on the outside surface of a beam window. The value was lower than the tolerance level of the stress strength of the material given by the legal limitation which is applied to the fast reactor. The repeated stress was evaluated to be below a permission level. Accordingly, the feasibility of a designed BW was confirmed in terms of structural design.



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