Design and Beam Measurements of Modified Fast Extraction Schemed in the CERN PS for Installing a Dummy Septum to Mitigate Ring Irradiation

The proposed Multi-Turn Extraction (MTE) for the CERN PS allows reducing the overall extraction losses for high intensity beams. The required longitudinal structure of the proton beam induces unavoidable beam losses at the magnetic extraction septum. The installation of a dummy septum with an appropriate shielding has been proposed to localize losses and to shadow the magnetic septum. Such a device, located in the extraction region, imposes tight constraints on the available beam aperture. Modified extraction schemes have been proposed, which will be presented and discussed in detail in this paper together with the measured performance