|Luminosity Measurement in ATLAS|
This contribution summarizes the method ATLAS intends to exploit to determine the LHC machine luminosity. The measurement is performed during dedicated runs, where elastically scattered protons are detected at very small angles, and the luminosity is extracted from the theoretically well known Coulomb cross-section. The same data are used to normalize a luminosity monitor, which then provides the instant luminosity during normal physics running. The physics method is described, as well as the experimental devices and the expected performance.