Challenges and Plans for the Ion Injectors

With this high brightness beam, a Pb–Pb run at 7Z TeV performed with the current filling scheme, described in Section 2.2 below, would deliver a peak luminosity of 27 2 1 2.3 10 cm s . Since the peak luminosity requested by the ALICE experiment for the HL-LHC era [3] is of the order of 27 2 1 7 10 cm s , a missing factor of 3 is still to be found. The retained solution is to increase the number of bunches in the collider, as the bunch brightness is already a limiting factor on the flat bottom of the SPS, due to space-charge and intra-beam scattering [4]. Increasing the bunch intensity would also decrease the luminosity lifetime due to a resulting larger burnoff rate [5].