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Description
Abstract: The accuracy of the knowledge of the energy of the LHC protons is an important quantity for the high energy physics community, since it directly affects the error in the estimate of the Higgs mass (or any other new particle). Two complementary methods are viable: what can be obtained through beam dynamics measurements and what can be obtained through the knowledge of the magnetic field. Recently the high physics community has requested to review both methods, to provide a consistent number for the energy error associated to the LHC protons. In this seminar we will present the expected accuracy of the knowledge of the magnetic field, based on design principles, on electromagnetic modelling, and on magnetic measurements. Thanks to all this elements we estimate the field accuracy of the magnetic field in the LHC in the order of 0.1%.