Operational Experience with Third Harmonic RF Improved Beam Acceleration Through Transition in Main Ring Cavity for the Fermilab

An RF cavity operating at three times the frequency of the present, Main Ring rf system at, Fermilab has been installed to minimize the beam loss and longitudinal emittance (q) growth related to the transition crossing. Test,s have been carried oiit with beam intensities ranging from 3x109 to 2.3~10'" ppb and €1 21 .07 eVs . No beam loss conditions have been attained. Attemptas have been macle to reduce emittance growth after the transition.