UNDERSTANDING THE BEAM EMITTANCE EVOLUTION DURING STABLE BEAMS BASED ON EMITTANCE SCANS

High-luminosity production at the LHC is closely linked to the size of the transverse beam emittance. However emittance measurement is challenging. It is important to use multiple methods for emittance measurement to gain confidence in the absolute value measured and to improve our knowledge of emittance evolution during ?stable beams? conditions. In these proceedings, the potential of emittance scans for emittance measurement is studied. Comparison between the emittance measured using emittance scans at CMS in the noncrossing plane and wire scanners is presented. Emittance evolution in the long LHC fills, and comparison to synchrotron light monitors, sources of the systematic uncertainty, and future plans for analyses are described.