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低温永磁波荡器(Cryogenic Permanent Magnet Undulator,CPMU)是目前插入件技术发展的主要方向之一,其利用一些永磁材料,如钕铁硼(Nd Fe B)或镨铁棚(Pr Fe B)的磁场性能在低温下明显高于室温的特性来提高波荡器性能和光源束流品质,工作温区为50-150 K,需要冷却系统的冷却。CPMU冷却系统主要包括过冷液氮冷却系统和磁体阵列冷却回路。本文介绍了上海光源(Shanghai Synchrotron Radiation Facility,SSRF)CPMU过冷液氮冷却系统的设计方案和设计参数,进行了系统主要热负载的分析;对冷却系统中关键设备之一的过冷换热器进行了设计,并计算分析了过冷氮流经CPMU冷却系统的全程阻力损失,为系统另一关键设备液氮泵的选型提供依据。对CPMU过冷液氮冷却系统进行的在线测试表明,该设计满足CPMU样机的冷却需求。
Cryogenic Permanent Magnet Undulator (CPMU) is one of the main directions for the development of insert technology. It uses some permanent magnetic materials such as NdFeB or PrFeB, Of the magnetic field performance significantly higher than room temperature at low temperatures to improve the performance of undulator and light beam quality, working temperature range of 50-150 K, the need for cooling cooling system. The CPMU cooling system mainly includes supercooled liquid nitrogen cooling system and magnet array cooling circuit. This paper introduces the design scheme and design parameters of Shanghai Synchrotron Radiation Facility (SSRF) CPMU supercooled liquid nitrogen cooling system, and analyzes the main thermal load of the system. It analyzes the design of the supercooled heat exchanger The calculation and analysis of the full resistance loss of the supercooled nitrogen flowing through the CPMU cooling system are provided to provide basis for the selection of the liquid nitrogen pump of another key equipment of the system. Online testing of the CPMU subcooled liquid nitrogen cooling system showed that the design meets the cooling needs of the CPMU prototype.