BEPC II氦低温系统的初步设计

The Preliminary Design of the Cryogenic System for BEPC Ⅱ

低温超导技术将应用于第二代北京正负电子对撞机 (BEPC II)。文中所设计的大型氦低温系统将为第二代北京正负电子对撞机的三个磁体 :超导螺线管磁体、插入四极铁磁体和高频超导腔磁体提供 4 .5 K下 80 0 W的冷量和 6 0 .0 L/ h的液氦产量。由于每个用户都有其特定的工作要求 ,该系统为每个用户配置一个控制杜瓦 ,以满足磁体的工作要求。

The design of the cryogenic system for Beijing Electron Positron Collider Ⅱ (BEPC Ⅱ) has been carried out. The superconducting technology will be used to upgrade the energy. The cryogenic system with cooling capacity of 800 W at 4.5K will serve three consumers: SCQ magnet, SC solenoid magnets and SC cavities. The paper presents the preliminary design of the cryogenic system. Two cold boxes are employed to provide cooling capacity of 800 W and three sub-coolers are used to assure that the three consumers are capable of running under superconducting state stably. The cryogenic system will run in the modes of cool-down, normality, abnormality, quench and warm-up, respectively.