  Beam dump window is one of the most important parts of beam dump of China
Spallation Neutron Source(CSNS). The material, structure and other concerned
issue have been discussed in this paper. Thermal analyses have been applied for
the beam dump window design. By comparison, GlidcopAL-15 and 316L have been
chosen as window material. The window section has been designed as inner convex
spherical surface and the window thickness has been set 1.5mm to 3mm by
structure optimization. The window safety has been confirmed under the damage
of magnet. All these analyses proved that the window can meet the requirements
of CSNS beam dump well.
