Specification of a System of Correctors for the Triplets and Seperation Dipoles of the LHC Upgrade

The luminosity upgrade of the LHC aims at reducing beta* from 55 cm to 15 cm or beyond. This can be achieved by the ATS [1] scheme and means of new large aperture superconducting triplet (IT) quadrupoles (150 mm), preferably using the Nb$_{3}$Sn technology in order to keep the gradient reasonably high (140 T/m). The field quality requires careful specification in order to ensure a large enough dynamic aperture (DA). In this context, dedicated corrector magnets are foreseen to provide semi-local corrections of specific multipole components and find the best possible compromise between the demand and what can be realistically achieved by the magnet manufacturer. In this paper the layout and main parameters of the IT corrector package are presented together with the correction strategy. Moreover, the foreseen performance is discussed in detail