用于中国散裂中子源调束的法拉第筒结构优化设计

本文将法拉第筒应用于中国散裂中子源前端系统和漂移管加速器临时线两个调束阶段，以吸收和截止束流。根据给定的束流物理参数，法拉第筒选择石墨吸收束流，紧贴石墨的无氧铜作为导热材料。通过靶型和冷却效率分析比较，确定采用单斜板靶，束流与靶面夹角为10°，同时设计了新型的瀑布型并联圆孔水冷结构。采用有限元软件ANSYS对结构模型进行热分析，对水冷管孔径和孔间距进行优化。经结构分析和应力变形校核，保证了加工制造的可靠性。用本文研制的法拉第筒顺利完成了调束任务。

Optimum Design of Faraday Cup Structure for Beam Adjustment of China Spallation Neutron Source

Faraday cup was used to absorb and stop the beam during the two phases of beam commissioning, such as the front end (FE) system and the temporary line after the drift tube linac (DTL) at the Chinese Spallation Neutron Source (CSNS). According to the beam physical parameters, graphite was selected to stop the beam directly and oxygen-free copper, which was just behind the graphite, as the thermal conductive material. Through the analysis and comparison of the target type and cooling efficiency, the single slant target was determined. The inclination angle of the target surface to the beam was set to 10°, meanwhile a new waterfall type water-cooled structure with parallel tunnels was designed to improve the cooling efficiency. The finite element software ANSYS was used for thermal analysis of the model, by which the diameter and space of water-cooled tunnel were optimized. Structure analysis and stress deformation were checked to ensure the reliability of the manufacturing. With the Faraday cup discussed in this paper, the beam commissioning went well.