Design of the RF Phase and Amplitude Control System for a Proton Linear Acceierator

The specifications on RF amplitude and phase in a proton linear accelerator are reviewed. The expected amplitude and phase disturbances during normal operation are discussed, showing the need for fast control of these parameters during the beam-on period. Analytical expressions are derived for the response of the RF amplitude and phase envelopes in an accelerator structure to amplitude or phase modulations in the drive. Experimental results verifying the theoretical expressions are presented.