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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.
Low temperature superconducting technology is applied for the first time in BEPCⅡ.The low temperature control system can generate saturated liquid helium by controlling the process variables such as pressure, liquid level, flow rate and power in the front cryogenic system, Two-phase helium and supercooled single-phase liquid helium use these three different forms of helium flow to cool superconducting devices. The cryogenic control system uses the EPICS + PLC dual-layer architecture to achieve fully automatic control of the front cryogenic superconducting equipment EPICS mainly completes the process control, logic control and PID closed-loop control of the cryogenic system; PLC is responsible for the interlock control of the front-end key equipment for protecting the safety of the cryogenic superconducting equipment.