A CORBA BASED C LIENT-SERVER MODEL FOR B EAM D YNAMICS A PPLICATIONS AT THE SLS

A distributed object oriented client-server model, based on the Common Object Request Broker Architecture (CORBA), has been established to interface beam dynamics application programs at the Swiss Light Source (SLS) to essential software packages. These include the accelerator physics package, TRACY, the Common DEVice (CDEV) control library, a relational database management system and a logging facility for error messages and alarm reports. The software architecture allows for remote clients to invoke computer intensive methods, such as beam orbit correction procedures, on a dedicated server running the UNIX derivative, Linux. Client programs typically make use of graphical user interface (GUI) elements provided by specialized toolkits such as Tk or Java Swing, while monitored data required by procedures utilising the TRACY library, such as beam optics parameters, are marshalled to the model server for fast analysis. Access to the SLS accelerator devices is achieved through a generic C++ CDEV server. The architectural model components are described and a prototype application within the beam dynamics environment is presented.