LHC beam and luminosity lifetimes revisited

The single beam lifetimes and luminosity lifetime during LHC Stable Beams in 2012 for a large number of fills are considered. The evolution of single beam lifetime through a given fill is obtained from fits to BCT data and from the combination of luminosity losses and calibrated beam loss to collimation. A breakdown of the single beam lifetime into principle components is performed allowing a quantitative picture of component lifetime evolution during Stable Beams. The situation before and after the octupole polarity change and concomitant increase in chromaticity in August 2012 are compared. The analysis is extended to the luminosity lifetime and an attempt to made to evaluate emittance growth from the luminous region size and luminosity evolution through the fill.