Longitudinal damping in the Tevatron collider

The damper design for six proton on six antiproton bunches in the Tevatron collider is described. Signal pickup, transient phase detection, derivative networks, and phase correction via the high-level RF are addressed. Each RF station is controlled by a slow feedback loop. Global feedback loops control each set of four cavities, one set for protons and one set for antiprotons. Operational experience with these systems is discussed. Due to the disappearance of the motivating synchrotron oscillation growth measured in the last collider run, only the proton system is useful, and only at injection. >