Control of Fermilab Booster Tunes

Control of the radial and vertical tunes of the Booster is implemented using ramped correction quadrupoles. Minor modifications to the power supply cards for the 48 (previously) d.c. correction quadrupoles allow the tunes to be continuously programmed orheld constant throughout the 33 ms acceleration cycle. This capability is in addition to the usual use of these quadrupoles to be independently varied to correct for harmonic distortions in the lattice. An automatic computer program measures and displays the tunes vs. time in the cycle to monitor performance and to allow the ramps to be adjusted by the machine operator.