  The extraction bucket position in the Fermilab Booster is controlled with a
cogging process that involves the comparison of the Booster RF count and the
Recycler Ring revolution marker. A one RF bucket jitter in the extraction
bucket position results from the variability of the process that phase matches
the Booster to the Recycler. However, the new slow phase lock process used to
lock the frequency and phase of the Booster RF to the Recycler RF has been made
digital and programmable and has been modified to correct the extraction notch
position. The beam loss at the Recycler injection has been reduced by 20%. Beam
studies and the phase lock system will be discussed in this paper.
