Results of the ALS booster ring RF system upgrade for top-off mode of operation

ALS, one of the first third generation synchrotron light sources which has been operating since 1993 at Berkeley Lab has been upgraded from its present operation scenario of injecting the 1.5 GeV electron beam from the Booster ring into the Storage ring every 8 hours, where it is accelerated to the final energy of 1.9 GeV, to full energy (1.9 GeV) injection from the Booster ring into the Storage ring every 3 seconds for filling and every 30-35 seconds for "Top-Off" mode. Additionally the beam current will be increased from the time averaged value of 250 mA to 500 mA to increase the brightness. In this paper we will present the final design of the Booster RF power source and control system upgrades and the performance results of the new ALS injector RF system set-up for Top-Off mode of operation.