BEPCII超导螺线管磁体及低温系统热负荷分析

Thermal analysis of superconducting solenoid magnet and its cooling system in BEPCII

采用三维有限元和有限体积软件对北京正负电子对撞机重大改造项目(BEPCII)超导螺线管磁体(SSM)及低温冷却系统的主要设备进行了热负荷计算及分析.计算结果表明,在现有设计结构下,SSM超导磁体工作温度在4.5 K左右,满足性能要求;磁体及低温系统的总热负荷约120 W,同时还需要0.4 g/s的冷氦流冷却电流引线.从热负荷分布分析,由于磁体结构尺寸大,热辐射漏热为主要漏热;传输管线漏热占系统总漏热的10%左右.计算结果为超导磁体低温系统的设计和进一步优化提供了依据.

Numerical simulation and analysis of temperature distributions and heat loads were carried out for the superconducting solenoid magnet （SSM） and its cooling system by FEA and FVM software package in Beijing Electron-Positron Collider Upgrade （BEPCII）. The results show the SSM magnet works well at around 4.5 K under current structure. The total heat load is about 120 W plus 0.4 g/s helium flow for cooling a pair of SSM current leads. The dominant load for the magnet is heat radiation from high temperature region. The heat leakage to the transfer lines is around 10 % of the total load. The heat loads and their distribution are the base for the design and optimization of the SSM cryogenic system.