Slow control system of CEE-TPC

The Time Projection Chamber (TPC) serves as the central detector of the Cooling Storage Ring External-target Experiment (CEE) spectrometer, designed to precisely measure dE/dx, momentum information, and charged particle trajectories of large-angle reaction products in nuclear experiments conducted at the Heavy Ion Research Facility in Lanzhou (HIRFL). To achieve accurate tracking of charged particles in the large-angle region and enable particle identification in conjunction with other detectors, real-time monitoring and control of the detector system are essential. For this purpose, a Slow Control System (SCS) was developed and implemented using the Experimental Physics and Industrial Control System (EPICS) software toolkit. This system monitors and controls the TPC's operational parameters, including gas flow, laser system performance, front-end electronics, and environmental conditions, while also overseeing auxiliary devices in real time. Such comprehensive monitoring ensures high-precision position and time measurements with the detector. This paper presents the design, components, commissioning, operation, and performance evaluation of the TPC SCS.