C-ADS中质子束窗散射效应和热力学计算

质子束窗是C-ADS中隔离加速器的真空环境与靶的非真空环境的重要部件。质子束窗材料及其冷却介质造成的束流散射效应是造成束流在靶外损失的主要因素，由于质子束窗中的高能量沉积和高辐照效应，束窗的热力学计算显得尤为重要。计算结果表明:当质子束窗和散裂靶距离为1.5 m时，通过选取合理的结构参数，多管道型质子束窗结构可以将靶外束流损失控制在1%以内。束窗中总的应力，包括由于温度升高造成的热应力、冷却剂的静压，以及束窗两侧加速器真空与外部非真空环境的压强差造成的应力，可以有效控制在所用材料的许用应力之内。并通过计算讨论给出C-ADS中质子束窗的初步设计参数。

Proton scattering effect and thermohydraulics study of proton beam window for C-ADS

Proton beam window (PBW) is a critical component of the China accelerator-driven system (C-ADS), which will isolate the accelerator vacuum from the target. Scattering effect induced by material of the PBW and the cooling medium is the most important factor causing the beam loss out of the target. Very high energy deposition and irradiation load of the PBW make the thermal hydraulic research especially indispensable. For beam window with multiple pipe structure, calculation results show that lost particles can be controlled within 1% when the beam window is located at 1.5 m from the target. The stress induced by heat load and cooling medium as well as pressure difference over the PBW can be controlled within permissible stress of present selected material. Primary parameters of the PBW of C-ADS are also given through analysis and discussion.