Upgrade of Controls for SPEAR

Richard Garrett
SLAC/SSRL

The SPEAR electron synchrotron is an old and venerable facility with a history of great physics. When this storage ring was converted to serve as a full-time synchrotron light source, it was evident that the facility was due for an overhaul of its control system. Outdated hardware and custom software interfaces, along with the control cumputer system itself, were replaced with off-the-shelf distributed intelligent controllers and networked X-windows terminals and workstations. However, almost all applications and control functions were retained by simply rewriting the layer of software closest to each new device. The success of this upgrade has prompted us to do a similar upgrade of our Injector system. Although the Injector was already running an X-windows based control system, it was non-networked and Q-bus based. By using the same ethernet based controllers used to upgrade SPEAR, we will be able to integrate these two systems into one that resembles the 'standard model' for control systems, and at the same time preserve the applications software that has been developed over many years on both systems.