TRIUMF: Canada's national laboratory for particle and nuclear physics

Conceptual design study for the TRIUMF control and safety system Chan, C.; Heywood, D.; Johnson, R. R.; Jones, G.; Sloan, D.; Fredriksson, O. K.; Brown, W. S.; Campbell, J. D.; Mares, T.; Tilison, L. J. P.; William M. Brobeck & Associates; Dilworth, Secord, Meagher and Associates Limited


A general philosophy for the control of the TRIUMF facility has been presented. The hard-wired personnel safety system is based on a system of controlled access areas. Radiation levels throughout the facility are routed through area safety units to central control. Violation of a personnel interlock results in interruption of the beam delivery to the entire facility. A change in radiation levels beyond prescribed limits will also interrupt beam delivery. The machine safety system is based on beam characteristics. Both relative and absolute beam intensity limits are proposed. A beam shut-off time of about 300 μsec is adequate for machine protection, while personnel protection requires the shortest possible beam shut off time. A computer-based scanning and digitizing system permitting fast and flexible data processing is proposed for the ion source and injection system. The radio frequency will be a fixed reference to which the main magnet field is controlled. The main magnet is regulated by a current shunt and/or an NMR probe. Trim and harmonic coils are current regulated. A scanning system monitors temperatures by measuring the coil voltages and currents and calculating the coil resistance. Beam diagnostics probes will be mounted at 90 deg intervals. Two probes will measure beam current and two will be shadow probes. High energy beam transport optics will be set using one-word memories at power supplies. A slow scanning system will be used to log optics parameters. Diagnostic devices which are proposed include position, profile, and intensity monitors. Computer control which is redundant in CPU and I/O capability has been proposed. Operator communication with devices will proceed through the central computer using CRT-keyboard-shaft encoder stations. An integrated TV display system using standard TV monitors Is proposed. TV camera output, computer graphics and analog signals from diagnostic devices will be handled by the same system. Few if any control loops will be closed at commissioning. Data logging will be performed by a digital data acquisition system. Set points will be controlled by an operator using a digital link. As machine development progresses control loops will be closed.

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