The Application Of EPICS In CSRe Control System

To solve the problems existing in present control system of Cooler Storage Ring of Heavy Ion Research Facility in Lanzhou( HIRFL-CSR), this paper adopts EPICS(Experimental Physics And Industrial Control System) to development HIRFL-CSRe new control system, which is widely used in large international accelerators.Based on the theory of distributed system and structured analysis and design, this paper gives a method of EPICS control system development. Using structured analysis and design, system data structure is derived from the data flow. Through the data structure, IOC server external interface(PV) and client interface are defined. Device support of records and client applications accomplish the function modules of the system. System structure is designed based on the theory of distributed system.The control of CSRe power supply system, power supply monitoring system, timing system and vacuum system are designed and implemented by this method. The development works include system analysis, system design and system realization. In the system analysis stage, structured analysis method is introduced to get system requirements. System data flow diagram and data dictionary are established, which constrains the following development work. In the stage of system design, structured design method is adopted. Data flow diagram is devided into input, transformation and output. Module hierarchy is designed and transformed into client / server structure based on the theory of distributed system. Through vertical and horizontal system expansion, the optimized EPICS structure is achieved. In the realization phase of the system, according to the result of system design, IOC record device support and PV definition are achieved. Multiple threads and shared memory technology are used to improve system performance, at the same time client applications are developed in the CSS environment.This paper develops device support for OPC UA server and achieves the access of OPC UA nodes. Through the mapping of OPC UA nodes and EPICS PVs, the control of CSRe faraday cup FC01 is completed. Using this method, local control system of beam diagnoses can be connected to the CSRe EPICS main control system and beam diagnoses system can be controlled by the OPI(Operator Interface) in a unified way.Control system is developed on the basis of the system analysis and design, which improves the maintainability of the software. It improves control system expansibility to code in EPICS. Control system tests and runs in CSRe and running results show that the control system can significantly improve the CSRe parameters presetting function and has good stability and reliability. This paper applies EPICS in HIRFL for the first time and provides a theoretical basis and practical experience for the overall upgrading of the HIRFL control system.