A CONTROL SYSTEM FOR THE DESY ACCELERATOR CHAINS

DESY has nine accelerators in operation. The reliable and operator-friendly control of these accelerators is necessary for the successful operation of HERA, DORIS and PETRA in order to provide a good experimental environment for the four experiments at HERA and the numerous users of synchrotron light at DORIS and PETRA. As already reported in PCaPAC’96 PETRA was upgraded to a PC-based control system in spring 1996. Proven concepts and improved programs have been used to renew the control system of storage ring DORIS in the shutdown of 1997. A step by step migration of controls from the old system to the PC-based one is under way and is carried out during normal machine operation of the lepton and proton preaccelerators. In the following an overview of the underlying concepts of the homogeneous control system will be given.