Conceptual design study of beam window for accelerator-driven system

Sugawara, Takanori  ; Nishihara, Kenji  ; Obayashi, Hironari  ; Kurata, Yuji; Oigawa, Hiroyuki 

The conceptual design study for the beam window of the spallation target is one of the critical issues in the R&D of the accelerator driven system (ADS). In this study, the investigation to create a feasible concept of the beam window for the ADS was performed by changing the proton beam profile from the gaussian distribution to the parabolic and the flat distributions. The detailed analyses were performed by considering the particle transport of protons and neutrons in the spallation target region, the thermal hydraulics of lead bismuth eutectic (LBE) around the beam window and the structural strength of the beam window. The calculation results presented the concept with the parabolic distribution would be the most feasible concept in the current ADS design condition.