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the event of water failure, thus permitting the pump to cool before the loss of the high vacuum. The Klystron water switch removes the R.F. driving power, and the highvolt age when the water fails. If the blower power fails, a relay turns off the Klystron filaments, In as much as the high voltage is interlocked with the filaments, it is removed also.

A possible vacuum failure, say caused by a cracked glass seal, might if it occurred during operation, cause the cavity to go into a continuous discharge and would thus dangerously raise the standing wave ratio at the output seal of the high power Klystrons. This problem has been met in the most direct way by placing small probes in the waveguide opposite to the output seals. The pickup of these probes is rectified by crystals and through an amplifier operates relays which shut off the Klystron power. To guard against both high standing wave ratio and possible crystal failure, which would leave the system unprotected, the power is shut off if the crystal output becomes either too high or too low.

The Klystron protective circuit is shown in Fig. 14.