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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 requiresnew tuneable RF cavities, discussed separately in these proceedings. These arequarter wave cavities resonant at 52.809 MHz with a 10 kHz tuning range. The 10kHz range is achieved by use of a tuner which has an electrical length ofapproximately one half wavelength at 52.809 MHz. The tuner is constructed from3 1/8 inch diameter rigid coaxial line, with 5 inches of its length containingperpendicularly biased, Al doped Yttrium Iron Garnet (YIG). The tuner design,measurements, and high power test results are presented.

Perpendicularly Biased YIG Tuners for the Fermilab Recycler 52.809 MHz Cavities