A New RF System for the ORIC

The Oak Ridge Isochronous Cyclotron RF system has been converted from an RCA 6949 power amplifier to an RCA 4648 power amplifier. The primary incentive was to reduce tube replacement cost; however, improved system performance and reliability were also realized. Existing servo-tuned driver amplifier stages and RF voltage regulator loops were retained. Typical accelerating potential noise levels are about 0.05% to 0.1% peak to peak noise per peak RF voltage.