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- B. Dalena
CEA/IRFU, Gif-sur-Yvette, France
- R. Appleby
UMAN, Manchester, United Kingdom
- A.V. Bogomyagkov
BINP SB RAS, Novosibirsk, Russia
- A. Chancé, J. Payet
CEA/DSM/IRFU, France
- R. De Maria, B.J. Holzer
CERN, Geneva, Switzerland
- A. Faus-Golfe, J. Resta-López
IFIC, Valencia, Spain
- K.M. Hock, M. Korostelev, L.N.S. Thompson, A. Wolski
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- C. Milardi
INFN/LNF, Frascati (Roma), Italy
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The luminosity upgrade of the LHC collider at CERN is based on a strong focusing scheme to reach lowest values of the beta function at the collision points. Several issues have to be addressed in this context, that are considered as mid term goals for the optimisation of the lattice and beam optics: Firstly a number of beam optics have been developed to establish a baseline for the hardware R&D, and to define the specifications for the new magnets that will be needed, in Nb3Sn and in NbTi technology. Secondly, the need for sufficient flexibility of the beam optics especially for smallest β* values has to be investigated as well as the need for a smooth transition between the injection and the collision optics. Finally the performance of the optics based on flat and round beams has to be compared and different ways have to be studied to optimise the chromatic correction, including the study of local correction schemes. This paper presents the status of this work, which is a result of an international collaboration, and summarises the main parameters that are foreseen to reach the HL-LHC luminosity goal.
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