The proton beam window (PBW) is one of the key devices of China Spallation Neutron Source (CSNS). In this paper, a new designed PBW structure called singledouble layer structure is discussed. The new structure will be used in CSNS, and it is designed based on the beam characteristic of CSNS, which power is 100 kW. The structure design and thermal-analysis are presented, and the convective coefficient of cooling water is calculated. Besides, the radiation damage is discussed to assure there is

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... danger of radiation lifetime of PBW. ○ 2013 by JACoW -cc Creative Commons Attribution 3.0 (CC-BY-3.0) 07 Accelerator Technology and Main Systems T31 Subsystems, Technology and Components, Other Proceedings of IPAC2013, Shanghai, China THPFI029 07 Accelerator Technology and Main Systems T31 Subsystems, Technology and Components, Other ISBN 978-3-95450-122-9 3363 Copyright c ○ 2013 by JACoW -cc Creative Commons Attribution 3.0 (CC-BY-3.0)