Tevatron Status and Future Plans

Fermilab has just completed a very successful 1992-1996 Collider Run I which has led to the discovery of the top quark [1, 2] along with many other remarkable physics results. A typical luminosity of 2×10 cm s was achieved with 7×10 antiprotons in each of 6 bunches. The total integrated luminosity delivered to both the CDF and DØ collider detectors was about 150pb (see Fig. 1). The collider reliability was such that 72.6% (421 of 580) of the stores were ended intentionally. Table 1 lists the operational performance of the Collider at the end of Run-I, accompanied by operational goals for the complex following construction of the Main Injector and Recycler rings and a completion of the Tevatron33 project [3]. Typical luminosity at the beginning of a store translates to integrated luminosity with a 33% duty factor. Fundamental limitations are related to the total head-on beam-beam tune shift seen by antiprotons ξ and to the total number of antiprotons in the collider that is a product of the number of bunches and the number of p’s per bunch, Nb × Np. The beam-beam tune shift that can be tolerated by the antiprotons is believed to be limited by the tune space available between resonances up to about tenth order. Approximately 0.024 has been achieved in the past. For a given total number of antiprotons the luminosity does not depend upon the number of bunches.