Tune Correction for the SPS Ramp

The tune corrections applied in the ramp for a large palette of SPS cycle used in 2007 has been analyzed to evaluate the reproducibility and the dependence on the supercycle composition. The data highlights the excellent reproducibility of the SPS tune above momenta of 50~GeV/c, with little dependence on the injection momentum or the ramp speed. Difference are concentrated at lower momenta, but for similar cycles, the corrections are very reproducible and show only a small dependence on the supercycle composition. The data also underlines the positive impact on fixed target beams of the improvement in the tracking of the main power converters of the SPS that was obtained by reducing the point spacing in the ramp from 30~ms to 6~ms.