Improvements in bunch coalescing in the Fermilab Main Ring

In Fermilab's Main Ring bunch coalescing is used to produce intense proton and antiproton bunches for the Tevatron. For the bunch coalescing, 11 proton or antiproton bunches are rotated first in the fundamental RF harmonic of 53 MHz to reduce the momentum spread, then are rotated for a quarter of a period in a lower harmonic (h=53 or 2.5 MHz) and recaptured in a single 53 MHz bucket. The 2.5 voltage available for coalescing is 22 KV. Recently 3 new 2.5 MHz coalescing cavities were installed and the available 2.5 voltage was tripled. The coalescing improvements from this upgrade will be described.