  A second harmonic RF cavity which uses perpendicularly biased garnet for
frequency tuning is currently being constructed for use in the Fermilab
Booster. The cavity will operate at twice the fundamental RF frequency, from
~76 - 106 MHz, and will be turned on only during injection, and transition or
extraction. Its main purpose is to reduce beam loss as required by Fermilab's
Proton Improvement Plan (PIP). After three years of optimization and study, the
cavity design has been finalized and all constituent parts have been received.
We discuss the design aspects of the cavity and its associated systems,
component testing, and status of the cavity construction.
