Design And Development Of The Control System For Mass Spectrometry Beamline At Hefei Light Source

Following upgrading and renovating the mass spectrometry beamline at Hefei Light Source(HLS),the control system encountered new requirements concerning vacuum interlock logic and data analysis as it transitioned from a single-station,singlebeamline to single-beamline,dual-end stations.As a result,the control system for the mass spectrometry beamline at HLS has been redesigned and developed.After assessing the development status of control systems for beamlines at domestic and international synchrotron radiation light sources and taking into account the specific needs of the mass spectrometry beamline,a new control system for the HLS mass spectrometry beamline,based on EPICS,has been designed.The system is divided into vacuum interlock and motion control subsystems.The vacuum interlock system rapidly closes valves and shutters according to the interlock logic when an abnormal vacuum level is detected,isolating the front-end area and the storage ring,thus safeguarding the storage ring and beamline equipment.The vacuum interlock system primarily involves water cooling masks,pneumatic valves,vacuum gauges,and fast valve controllers.The hardware architecture of the vacuum interlock system is built upon the Yokogawa FA-M3 series Programmable Logic Controller(PLC),featuring custom-designed PLC interlock protection programs.The IOC applications are developed using the netDev driver,and the OPI is created by Phoebus.Additionally,the status data and alarm messages generated during the operation of the vacuum interlock system are stored in the data archiving system and the alarm system.The motion control system manages the optical components of the mass spectrometry beamline and provides technical means for beamline adjustments.The mass spectrometry beamline has only a few optical components equipped with three stepper motors.The hardware structure of the motion control system is designed based on the ZMC464 motion controller from ZMotion Technology and the SSDC06-ECX-H stepper servo driver from Mingzhi Technology,utilizing real-time Ethernet EtherCAT for communication between the motion controller and the driver.The motion control programs are designed using the ZDEVELOP integrated development environment.Furthermore,IOC applications are developed using the StreamDevice driver,and the OPI is created by Phoebus.Similarly,operational data from the motion control system is archived in the data storage and alarm systems.The new control system has been tested and implemented on the mass spectrometry beamline at HLS.The test results demonstrate that the vacuum safety interlock system’s logic is consistent with the design;the fast valve controller’s interlock response time is approximately 8.4 ms,better than the design target of 10 ms;the bidirectional repeatability positioning accuracy of the motion control system is 0.70 μm,better than the design target of 1 μm.These results indicate that the control system has successfully achieved its design objectives.