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The Fermilab Booster uses multi-turn beam injection with all its cavitiesphased such that beam sees a net zero RF voltage even when each station is atthe same maxi-mum voltage. During beam capture the RF voltage is increasedslowly by using its paraphase system. At the end of the capture the feedback isturned on for beam acceleration. It is vital for present operations as well asduring the PIP-II era that both the HLRF and LLRF systems provide the properintended phase and RF voltage to preserve the longitudinal emittance frominjection to extraction. In this paper, we describe the original architectureof the cavity phase distribution, our recent beam-based RF phase measurements,observed significant deviation in the relative phases between cavities andcorrection effort. Results from the improved capture for high intensity beamare also presented.

Recent Improvements in the Beam Capture at Fermilab Booster for High Intensity Operation