摘要
The superconducting cryogenic system has been designed and deployed in the Beijing Electron-Positron Collider Upgrade Project(BEPCⅡ).Process variables,including the pressure,level,flow and so on,are manipulated to get the liquid helium,two-phase helium flow and supercritical helium flow,which are used to cool down the three kinds of superconducting devices respectively.The system fully automates the superconducting cryogenic control with the structure of EPICS+PLC.EPICS is used to take charge of the process control,the logical control and the PID control loops whereas the low level interlocks of the pivotal equipments are run in PLCs to protect the superconducting device from damage.
北京正负电子对撞机重大改造工程(BEPCⅡ)首次应用低温超导技术建造低温系统.低温控制系统通过控制前端低温系统的压力、液位、流量和功率等过程变量,分别产生饱和液氦、两相氦和过冷的单相液氦,使用这三种不同形式的氦流来冷却超导设备.低温控制系统采用EPICS+PLC双层架构体系,实现对前端低温超导设备的全自动控制.EPICS主要完成低温系统的过程控制、逻辑控制和PID闭环控制;PLC负责前端关键设备的联锁控制,用于保护低温超导设备的安全.
