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For NOvA and future experiments requiring high intensity proton beams,Fermilab is in the process of upgrading the existing accelerator complex forincreased proton production. One such improvement is to reduce the MainInjector cycle time, by performing slip stacking, previously done in the MainInjector, in the now repurposed Recycler Ring. Recycler slip stacking requirestwo new RF cavities operating at slightly different frequencies (df = 1260Hz).These are copper, coaxial, quarter wave cavities with R/Q =13 ohms. Theyoperate at a peak gap voltage of 150 kV with 150 kW peak drive power (60% dutyfactor), and are resonant at 52.809 MHz with a 10 kHz tuning range. Two havebeen completed and installed. The design, high power test results, and statusof the cavities are presented.

Design and High Power Testing of 52.809 MHz RF Cavities for Slip Stacking in the Fermilab Recycler