| The injector II of China ADS project is undertaken by Institute of Modern Physics,Chinese Academy of Science. The RFQ for injector II will be operated at the frequency of162.5MHz, and the proton beam can be accelerated from35keV to2.1MeV. Theefficiency of input power and beam quality will decrease if the RF cavity detunes. So thestability and reliability of RFQ is very important for the whole injector. A stable andreliable control system for RFQ is required, which should supply an interlock protectionsystem, high frequency control system, water cooling and vacuum control system. It is adistributed control system based on EPICS, and the drivers for power source, watercooling, vacuum and interlock protection system have been completed. The redundancyPLC is used in interlock protection system to implement the control functions, which cangreatly enhance the system stability and reduce the failure rate. In this paper, thedevelopment of control system with redundant PLC controllers of RFQ accelerator basedon EPICS is firstly realized in China.The RFQ control system based on EPICS is introduced in this paper and theinterlock protection system is studied in detail. The EPICS drivers for redundancy PLCcontrollers and power source are expounded, in which, the data can be obtained fromboth PLC controllers without influence by the failure of PLC. EPICS drivers for the heatexchange, the vacuum gauge and the4068module are achieved by Streamdevice. Codesare written and modified into Streamdevice, and a new type of checksum is supported.The functions of cooling system control, the vacuum level read back and correspondingsound and light alarm are realized. Since, Labview is widely applied in the beamdiagnostic system and SRF test system, so the solution of data exchange between EPICSand Labview is investigated. Two ways—DSC module and CA Lab are presented in this thesis. The redundancy PLC controllers RFC460R PN3TX produced by Phoenixcompany is used in the interlock protection system to improve the system reliability. Themain signals with devices are analog and digital, and the data between the master andslave PLC can be synchronized by Gigabit fiber. The PLC programming is finished byPC WORX to collect the information of temperature, flow and pressure of all waterwaysof RFQ, as well as the data exchange with EPICS system. In addition, alarm and interlockprotection can be completed. The touch screen used for local control obtains data fromPLC based on OPC technology, and the interface is designed by Visu plus.The EPICS interface development is implemented by CSS, and RFQ controlsystem is verified to meet the requirements of beam tuning and operation.For the other related work, the control system for digital power supply based onmicrocontroller is finished. In the project, the microcontroller communicates with FPGAand finally the configuration and control of touch screen are all completed. |
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