Design of the upstream decay pipe window of the long baseline neutrino facility

Abstract The beam windows of high-energy lines are important, and it is sometimes difficult to design because necessary ensure particle propagation with minimum disturbance fulfill mechanical requirements at the same time. upstream decay pipe window long baseline neutrino facility Fermilab has an extremely large diameter (1.8 m), a thickness only 1.5 mm separate helium atmosphere in nitrogen on other side. Furthermore, center this dish-shaped expected be 200-mm-diameter beryllium dish welded outside aluminum alloy A6061, combination must withstand extreme conditions 2.4-MW, proton without leakage. These severe make unprecedented challenge. This paper describes static thermal-structural analyses based which structure been optimized, as well dynamic for understanding shockwave effects originating beam. After optimization, maximum von Mises stresses decreased significantly both normal operation accident cases, making our very reasonable.