  It is important to improve the frequency tracking between the RF drive and
the cavity field for the purpose of reducing longitudinal phase oscillations
and increasing the effective accelerating voltage. And this is especially
beneficial for Booster running at higher intensity with smaller beam emittance.
Optimizing the bias supply current curve for the ferrite tuners can reduce the
phase error between the RF drive and the cavity field, and also improve the
HLRF-to-LLRF frequency tracking efficiency.
