The Fermilab Permanent Magnet Antiproton Recycler Ring

The Recycler Ring is a 3.1km antiproton storage ring which will be constructed from permanent magnets and located in the Fermilab Main Injector tunnel. Its primary purpose is to store, cool, and recycle antiprotons used in the Tevatron Collider. The increased antiproton availability from the Recycler Ring will more than double the luminosity of the Tevatron to 2x10^32/cm^2/sec, and provide a platform for the eventual TeV33 upgrade path to 10^33/cm^2/sec. The Recycler Ring incorporates a number of innovative cost-saving features including strontium ferrite hybrid permanent magnets, a low-cost high-vacuum system, and novel stochastic cooling and broadband RF systems. Progress on the R&D program to demonstrate electron cooling of the 8 GeV antiprotons will be described. The low cost of this ring will allow it to be built and commissioned in parallel with the Fermilab Main Injector. This approach optimizes both the running time and physics discovery reach of the Tevatron, thereby permitting definitive searches for the light Higgs, mimimal supersymmetry, and high-statistics studies of the Top Quark.