Stochastic cooling at Fermilab

The stochastic cooling systems in use at Fermilab and some of the techniques that have been employed to meet the particular requirements of the antiproton source is discussed. Stochastic cooling at Fermilab became of paramount importance about 5 years ago when the anti-proton source group at Fermilab abandoned the electron cooling ring in favor of a high flux anti-proton source which relied solely on stochastic cooling to achieve the phase space densities necessary for colliding proton and antiproton beams. The design of the cooling systems was based to a large extent on the pioneering work performed at CERN, particularly at the Anti-proton Accumulator (AA). However, the Fermilab systems have constituted a substantial advance: large pickup arrays operating at microwave frequencies, extensive use of cryogenic techniques to reduce thermal noise, super-conducting notch filters, and the development of tools for controlling and for accurately phasing the system