  To date, the 120 GeV Fermilab Main Injector accelerator has accelerated a
single batch of protons from the 8 GeV rapid-cycling Booster synchrotron for
production of antiprotons for Run II. In the future, the Main Injector must
accelerate 6 or more Booster batches simultaneously; the first will be
extracted to the antiproton source, while the remaining are extracted for the
NuMI/MINOS (Neutrinos at the Main Injector / Main Injector Neutrino Oscillation
Search) neutrino experiment. Performing this multi-batch operation while
avoiding unacceptable radioactivation of the beamlines requires a previously
unnecessary synchronization between the accelerators. We describe a mechanism
and present results of advancing or retarding the longitudinal progress of the
Booster beam by active feedback radial manipulation of the beam during the
acceleration period.
