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A trip-out circuit for arcing or free-running trigger pulses in a linear accelerator.

The circuit described has been installed in a medical linear accelerator to operate the high voltage circuit interlock whenever arcing occurs in the high voltage pulse forming network (PFN) or should free-running occur in the trigger pulse generator for the main thyratron. The PFN charging pulses are monitored by a 10 Omega resistor placed in series with the high voltage power supply capacitor and fed directly into the circuit.