Fabrication and Operation of the 4 MV 53 MHz RF System for the Fermilab Antiproton Source Debuncher Ring

Design of a 53 MHz 4 MV short duty cycle rf system for bunch rotation in the Fermilab antiproton source has been described previously. Fabrication and installation of the system has been completed. The rf cavities in the system are comletely evacuated welded aluminum structures, each capable of generating 700 kV with a very low duty factor. This report will describe fabrication procedures, multipactor inhibiting techniques, and initial operating experience with the system, Of particular interest is the capability for reduction of the rf voltage to a very small value witin 40 microseconds (25 turns) at the end of the momentum reduction, thus inhibiting further bunch rotation.