Decomposition of beam losses at LHC

Abstract

The LHC collimation system provides betatron cleaning and off-momentum cleaning in two different locations of the LHC ring. In the betatron cleaning area, three primary collimators cut the primary halo in horizontal, vertical and skew planes. The beam loss monitors located downstream each of these collimators can be used to diagnose the main plane of loss. We present here a method to identify these beam losses at the LHC and decompose them as a linear

combination of loss scenarios using singular value decomposition to calculate Moore-Penrose pseudoinverse of the

scenario matrix. This matrix has been used to evaluate the type of beam losses in different stages of the LHC cycle.