Results of the LHC DCCT Calibration Studies

An important aspect of luminosity calibration measurements is the bunch population product normalization. In the case of the LHC, the treatment of this normalization can be split into three subjects: the total current measurement, the corrections from the non-perfect longitudinal distribution and the relative amplitude of the individual bunch populations. In this note, we discuss the first item in details and in the context of the 2010 and 2011 luminosity calibration measurements performed for each LHC Interaction Point. Effects Internal to the DCCT, the sensitivity to external factors, uncertainty related to the absolute calibration and comparison of two systems are all addressed. The DCCT uncertainty and numerical examples are given.