Abstract :
As the capability of isochronous cyclotrons increases, and the requirements of the experimentalist become more sophisticated, the problems of beam handling and transport become more complex and demanding. At the NRL Isochronous Cyclotron Facility, these problems have been solved by using solid state OR, AND, NOR, and NAND logic wherever possible. Initial beam path selection is through a select-safe circuit which allows only one of 15 beam paths to be energized. After selection, it cannot be accidentally shut down. Diode, diode-transistor, and transistor-resistor logic have been used for all beam handling and transport devices, and for light and readout switching. These circuits use diode matrices to control voltage, resistor matrices to mix currents, and transistors as switches. Defective lamps are determined by a circuit which allows all lights in the control room to be tested simultaneously by pushing one button. Plug in boards and relays, quick change indicators, 90-pin connectors, and miniature terminal strips are used to facilitate trouble shooting and programming. A portable mock-up of the control console was produced for circuit test purposes, for on site operation of a beam handling device, and as a training device for new operators.
