Design and Tests of a Low-Loss Multi-Turn Ejector for the CERN PS

Following the positive results of a three-year measurement campaign at the CERN Proton Synchrotron, a study of a possible implementation of the proposed Multi-Turn Extraction (MTE) based on beam splitting with stable islands in the transverse phase space was undertaken. A substantial reduction of beam losses, with respect to the present extraction scheme, could be achieved with the proposed technique when delivering the high-intensity proton beams required for the planned CERN Neutrino to Gran Sasso Project. Major modifications to the ring layout are needed, such as a new design of the extraction bumps including also the installation of three additional kickers to create a closed-bump over the five turns used to extract the split beam. The ring aperture was reviewed and improvements are proposed to reduce possible beam losses between beam splitting and extraction. The goal is to implement the proposed changes by beginning of 2008 and to commission the novel extraction during the 2008 PS physics run.