Performance of the Fermilab Main Ring during the 1988-9 Tevatron Collider operation

The Fermilab Main Ring performance (intensity, reliability, and efficiency) during the present collider run is discussed. Questions related to emittance and emittance growth, both transverse and longitudinal, and the impact of Main Ring losses on the Collider experiments are considered. It was found that Main Ring efficiency and reliability during the 1988-9 collider run have improved significantly relative to the previous run. The losses, while reduced, are still a concern for the experiments. The transfer efficiency for antiprotons, for large cores, or when extracting more of the core is limiting the collider luminosity