Autin, Bruno Cappi, R Garoby, R Gruber, J Riunaud, J P Schindl, Karlheinz Part. Accel. 103-119 58 1997 1997 The CERN PS is the oldest link in the LHC injector chain. A separate function substitute synchrotron is discussed. It would keep the versatility of the present machine and have a higher extraction energy to relax the tolerance on the microwave instability threshold at injection into the SPS. Its essential property would be an adjustable h variation near the isochronous regime to meet the requirements imposed by bunch compression at ejection. It would also be equipped with all the correction systems of a modern machine.