The Implementation For The Front-end Control System Of Beam Loss Monitor Based On EtherCAT

The heavy ion beams of Lanzhou heavy ion accelerator research unit(HIRFL)plays an important supporting role in the radiation characteristics of fusion materials,the single particle effect of semiconductor and clinical trials of cancer therapy research.As the existing various interference in practical working conditions,heavy ion beam of the accelerator pipeline has losing phenomenon of beam when it is running.Therefore it needs to control various detectors in accelerator pipes by synchronizing precision to collect relevant data and front-end processing analysis,so that engineer can better grasp the running situation of the beam.However,there are some restrictions on control quantity,compatibility,synchronization accuracy and the front-end processing function for traditional fieldbus.So the paper based on the EtherCAT bus technology,adopts distributed beam loss detector front-end control mode,uses FPGA to make the front-end processing for the detector data,to alleviate the pressure of the master to deal with the data.The paper first introduces the HIRFL and the background knowledge and working principle of beam loss detector,summarizes the practical application requirement.Secondly,the hardware and software of the whole system were designed and implemented based on the EtherCAT analysis.The hardware mainly according to the actual demand selects and designs acquisition card,controller,drive equipment,construction of control system and completes hardware development environment.The software mainly designs the data collection from the slave,the control of detector and the XML file,and the final control interface and database management.Finally using the upper system in the lab it according to the multi-axis control,collection,storage,display and synchronization,redundant performance requirements goes on functional and performance test.Using the advantages of EtherCAT in multi-axis motion control aspects,IO,good accurate synchronization and cRIO FPGA front-end processing in terms of data collection provides technical support and ensures normal operation and improvement of the system.Analysis of experimental data and the results illustrate the usefulness of the system.The paper provides the reference and design experience for part improvement of HIRFL beam diagnostic system.