Instrumentation and Electronics in the Beam Switchyard

Beam monitors include current-measuring toroids, beam position monitors, equipment for observing beam profile by optical (TV) means, and secondaryemission monitors for measurement of intercepted beam current on energy absorbers, for observing energy absorbers, and for observing energy spectrum. The transport control system controls magnet currents and slit and collimator position, and also includes associated measurement equipment for monitoring magnet currents and fields and the positions of energy-absorbing devices. This system includes a control computer for automatic setup of the transport parameters. The equipment protection system consists of sensors in the BSY to monitor radiation, temperature, water flow, the positions of energy absorbers and other movable instruments, vacuum system pressures, and so on; sensor electronics in the control room for signal conditioning; and a summary circuit to provide the necessary signals for the master machine protection circuitry at the Central Control Room (CCR) and the injector. This system protects the instruments from beam-induced damage and is not intended for protection of personnel. (Personnel protection is described in Chapter 21.) The magnet power supplies provide the pulsed and dc power for all of the magnets in the transport and deflection system. Each of these four will be described in greater detail below, but a few general remarks will be made here. Because of the high radiation levels