A Two Level Trigger Selector for a High Mass Di-Muon Experiment

The entire electronic trigger system for a large experiment has been designed and constructed specifically for that experiment. The only commercial logic used was for monitoring, primarily scalers. This was not entirely by choice. The needed logic functions were not available, and the number of discriminator, delay, and latch channels required made using standard NIM logic modules an unpleasant solution. As built, the entire system, including power supplies, a NIM bin and a CAMAC crate for monitoring and control, fits easily in 3 relay racks. These racks are located in the experimental hall, near the experiment, and are accessible only via CAMAC when the beam is on. All functions of the system are programmed with special CAMAC modules.