Alternative bunch filling schemes for the LHC

The standard batches transfered from the PS to the SPS consist of 72 bunches each (in 3.6 s PS cycle). Alternative schemes with 48 bunches per batch (in 2.4 s PS cycle) have been investigated as backup solutions or in case of problems. The implications for the performance and the injector chain have been studied and are presented. Only filling schemes for proton operation are considered. Other filling schemes such as the bunch disposition for ion operation are not changed.