Trigger control system of the PF linac

The trigger control system of the Photon Factory 2.5 GeV electron linac at KEK is described. The trigger system is composed of a pulse repetition rate generator, a storage ring rf synchronizing system, main delay modules and a sector trigger system. Some trigger modules have microprocessors and are fully controllable by the linac control system through a serial communication line. Some other trigger modules are planned to be remotely controlled using CAMAC modules or RS232C communication lines. (orig.)