Performance and luminosity models for heavy-ion operation at the CERN Large Hadron Collider R. Bruce, M. A. Jebramcik, J. M. Jowett, T. Mertens and M. Schaumann Eur. Phys. J. Plus, 136 7 (2021) 745 Published online: 12 July 2021 DOI: 10.1140/epjp/s13360-021-01685-5