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Hosting six different experiments at four different interaction points andwidely different requirements for the running conditions, the LHC machine hasbeen faced with a long list of challenges in the first three years ofluminosity production (2010-2012, Run 1), many of which were potentiallycapable of limiting the performance due to instabilities resulting from theextremely high bunch brightness. Nonetheless, LHC met the challenges andperformed extremely well at high efficiency and routinely with beam brightnessat twice the design, well over one-third of the time in collision for physics,average luminosity lifetimes in excess of 10 h and extremely good backgroundconditions in the experiments. While the experimental running configurationsremain largely the same for the future high luminosity proton-protonoperational mode, the energy and the luminosity should increase significantly,making a prior assessment of related beam-beam effects extremely important toguarantee high performance. Of particular interest is the need for levellingthe luminosity individually in the different experiments. Luminosity control asthe more general version of 'levelling' has been at the heart of the successfor LHCb, and to a large extent also for ALICE, throughout Run 1. With theincreasing energy and potential luminosity, luminosity control may be requiredby all the experiments at some point in the future as a means of controllingthe pileup conditions and trigger rates, but possibly also as a way ofoptimizing the integrated luminosity. This paper reviews the variousmotivations and possibilities for controlling the luminosity from theexperiments' point of view, and outlines the future running conditions anddesiderata for the experiments as they are viewed currently, with the aim ofgiving guidelines for different options.

Future wishes and constraints from the experiments at the LHC for the Proton-Proton programme