Proceedings of ICALEPCS2003, Gyeongju, Korea UPGRADING THE ESRF ACCELERATOR CONTROL SYSTEM AFTER 10 YEARS OF OPERATION

• A client server model to implement distributed The ESRF accelerator control system was developed objects written in C and using RPCs for more than 10 years ago and has been running communication (TACO)[1],[2]. continuously since 1993. At that time the state of the art, • The graphical user interface (GUI) uses X11 and the in accelerator control, were front-ends based on VME technology and UNIX workstations. Our client server Motif toolkit. During the years several independent sub-systems have model was written in C with an object-oriented approach been added around the basic control system kernel (data and using RPCs on the communication layer. GUIs were based on X11 and Motif. cache, archiving, events, security etc.) with their own configurations, APIs and tools. But, the control system Since several years we had to address problems on design ends with the client API. Control and machine different levels. On the industrial market VME technology was largely overtaken by PC technology. Due to lack of evolution and support we had frozen the OS/9 physics applications have been developed independently using the API. real-time operating system on our VME front-ends in 1996. The upcoming Web and Java technologies did not integrate easily with our C programming framework. We decided to upgrade the control system on all layers. On the front-end layer compact PCI crates running Linux are now the workhorses. But, following the industrial market, Windows based front-ends and PCI hardware are gaining more and more ground. On the communication layer CORBA was chosen for its multi language suppor

ESICM LIVES 2016: part two : Milan, Italy. 1-5 October 2016.

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