TPE SLAC BEAM SWITCHYARD COPmROL COMWrER

Summary A computer system has been developed at SLAC in the beam switchyard for on-line beam transport control. The system consists of an SDS '925' computer and various specially designed interface devices. The system scans and records changes in interlocks and status signals; sets up, monitors, and maintains magnet curren:s and controls collimator and slit apertures. In addition to standard card and teletype input-output, the system has special panels for operator control of magnet currents and slit and collimator settings. A link to another computer provides for remote information access and control for experimenters. fa important feature of the system is the operator oriented language which is provided for operator/computer interaction. The language is arranged so that an inadvertent acsion of the operator cannot adversely affect the computer ?rogrz~ A single computer instruction can vary a group of magnets simultaneously to change the beam energy while maintaining a given beam focussing condition. A fine-tune controi has been provided so that the current in an arbitrary group can be controlled by a single switch. The operator can write ins'ructions in the language which are synchronized in time to l/360 of a second, and/or repeated at prescribed time intervals. i- Work supported by the U. S. Atomic Energy Commission + Now at CERN, Geneva, Switzerland