Abstract:
According to the requirements for the cryogenic vertical measurement system of the Chinese ADS Front-end Demo Linac(CAFe), a 2K superconducting cryogenic vertical measurement control system is designed. One of the main difficulties of the system is to achieve 2K process control in a simple and reliable way, and the other is the control of the pressure in the Dewar during the temperature recovery process. To address these two points, Sequencer, an integrated package in the Experimental Physical and Industrial Control System(EPICS), was used in the paper to implement control of sequential processes such as gas displacement and cavity cooling, enabling easy implementation of multiple process controls. For the temperature recovery process, components such as a Programmable Logic Controller(PLC) are used as the hardware control part, and fuzzy Proportion Integral Differential(PID) a control of the heater is used to stabilize the pressure in the Dewar. The smaller response time and overshoot compared to conventional PIDs ultimately provide a viable and efficient solution to achieve a 2K superconducting cryogenic vertical control system.