Design Of The Control System For The Enrichment Device Of ³⁹Ar

³⁹Ar is a radioactive isotope that plays an important role in the isotope dating of environmental science and archaeology.However,due to the low abundance of ³⁹Ar which is inartificail,the efficiency of isotope detection of ³⁹Ar is extremely low.The enrichment device of ³⁹Ar,designed for solving the problem of low abundance of ³⁹Ar,is a pretreatment device used before the detection of ³⁹Ar.The enrichment device of³⁹Ar is a small accelerator,capable of providing high-current beam,which can improve the abundance of of ³⁹Ar through the process of"ionization-mass spectrometry separation-targeting and collection"to improve the efficiency of isotope detection for39Ar.The control system is the brain and nerves of the ³⁹Ar enrichment device.In order to ensure that the device can run following the expected aim safely and stably,and efficiently ionize the sample Ar gas,efficiently transmit,resolve and collect the Ar⁺beam,and finally achieve the purpose of improving the abundance of ³⁹Ar,there is a control system scheme with EPICS software architecture designed for the enrichment device of ³⁹Ar in this paper,which is proposed after analyzing the basic composition,the working principle,the functions of various parts and the controlling requriment of the device.The control system uses the industrial computer+PCI board,PLC controller and serial port server as the hardware platform,and builds a distributed control network through the central switch.The PLC,as device controller,is use for the collection and control output of RTD thermal resistance,analog signal and digital signal.The industrial computer is the core of the control system,running the EPICS IOC program and the interacting software in client-side?OPI?.The EPICS IOC program is developed based on the LabVIEW environment,and uses the DSC module inside LabVIEW to include the control program into the EPICS architecture;The OPI is developed based on the CSS environment,and completes the synchronous updating of PV?Process Variable?with EPICS IOC by associates the interface control with PV and configuring the IOC IP address.The EPICS IOC program is the core of the control system software.It mainly completes the device status monitoring and the process controll for key equipment by establishing a TCP connection with the PLC and the underlying device controller.The process controll for key equipment is the key to improve the abundance of³⁹Ar,to simplify the programming of it,process state transfer analytical method is used for assisting in this paper.At the same time,in order to prevent the device from being damaged or even causing personal injury to the experimental personnel when the device is abnormal or faulty,the EPICS IOC program also establishes a safety interlock protection subsystem,using for real-time monitoring of the device's operating status and taking corresponding measures when the device is abnormal or faulty measures,to protect the equipment and personal safety of laboratory personnel.In view of the surge voltage generated by the ignition of the ion source and the signal interference in the strong electromagnetic environment during the operation test of the device,corresponding effective solutions are provided in the paper.After repeated testing and adjustment,the control system has been put into use and assisted in completing the relevant Ar gas enrichment experiment.It is showed that according to the result of the experiment,the device can improve the abundance of ³⁹Ar by more than an order of magnitude.The control system designed in this paper is a guarantee for ³⁹Ar enrichment device to achieve the expected design goals.