Consolidation project of the electrostatic septa in the CERN PS ring

After almost two decades of reliable service, the electrostatic septa of the CERN PS complex need to be upgraded. This is to fulfil the increased requirements on vacuum performance and the need to reduce the time spent on maintenance interventions. Two electrostatic septa are used in the PS ring: septum 23 is used for a resonant slow extraction, while septum 31 is used for the so-called 'continuous transfer' (CT) 5-turn extraction. This paper describes the experience gained with these septa over the years. We report the main characteristics and technological advantages of the new septum 23, together with its present performance.