Revised beam dynamics and layout for the superconducting section of the SPL

Since the publication of the SPL conceptual design report [1] the beam dynamics and the layout of the linac were subject to several hanges. As the studies of the room temperature part of the lina [2] show practically no emittance growth, the longitudinal emittance in the SC section of the SPL is reduced from 0.6 to 0.3 p deg MeV. This measure enhances the longitudinal debunching eject in the transfer line between the SPL and the Proton Driver Accumulator Compressor rings (PDAC). A modified layout for this transfer line which stretches the bunches in phase and compensates energy and phase jitter from the linac is presented. A new matching tool for the IMPACT code is used to improve the transitions between the different sections of the linac. Furthermore the results of a study concerned with cavity vibrations [3] is taken into account to readjust the synchronous phases in the linac. Finally a new alternative for the high energy section of the linac is tested, which uses no LEP cavities and which reduces the linac length by almost 90 m. The results of multiparticle simulations with matched and mismatched beams are presented for both versions.