Strong focusing insertion solutions for the LHC luminosity upgrade

This paper shows that dealing appropriately with the geometrical loss factor opens the possibility of large luminosities with a lower beam current thanks to applying significantly stronger focusing. The peak luminosity potential is as large as 2×1035 cm-2s-1 for the full upgraded beam current, with scope for achieving a luminosity of about 1×1035 cm-2s-1 with reduced bunch current and/or increased bunch spacing. The required quadrupole aperture would need to be increased to about 125 mm.