Resonator control system

Control of the resonators is to be achieved in a manner similar to that used on the Stony Brook LINAC. The resonant cavity is made to oscillate by making it part of a self-excited feedback loop. The loop consists of an rf amplifier and an electronic module whose phase shift and attenuation can be controlled. Oscillation occurs at the point where the total loop phase shift is a multiple of 360 degrees. If the phase shift external to the resonator differs from 360 degrees, then the resonator must oscillate off resonance to make up for this phase difference. In this manner control is achieved over the frequency of the resonator and it can be locked to the phase of the master oscillator