The 4-8 GHz stochastic cooling upgrade for the Fermilab Debuncher

During the Fermilab Collider Run II, the Main Injector is expected to provided a three-fold increase in flux of the proton beam sent to the antiproton production target as compared to the previous Collider Run Ib. This increase in antiproton production rate to 20/spl times/10/sup 10/ antiprotons/hour will be handled by upgrading the stochastic cooling systems in both the Debuncher and Accumulator rings of the Fermilab Antiproton Source. In the Debuncher Ring, the upgrade calls for increasing the stochastic cooling system bandwidth from 2-4 to 4-8 GHz. The effective front-end noise temperature of the cooling systems will also be lowered from 125 K to 35 K. This paper will discuss some details of the system design of the new 4-8 GHz cooling systems in the Debuncher Ring.