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Measurements of beam halo dynamics were conducted in the LHC on 22 June 2012 at 4 TeV using collimator scans. Four scans were performed: on proton beam 1 with a vertical collimator and on beam 2 with a horizontal collimator, first with squeezed separated beams and subsequently in collision. The time evolution of losses following collimator steps provides experimental estimates of halo diffusion, halo population, impact parameter distributions, and beam jitter. Besides its general interest for beam dynamics and machine performance characterization, this information forms an essential input for the general design of collimation systems, including new methods such as crystal collimators and hollow electron lenses. In this note, the results of an analysis of the data is presented.

Measurements of Transverse Beam Halo Diffusion Rates in the LHC With Collimator Scans