Low gradient triple layout options

The paper summarises two options for a quadrupole first layout with low gradient triplet magnets that are compatible with NbTi magnet technology. The presentation lists the main design options and discusses the advantages and challenges for each implementation. MOTIVATION The triplet aperture is a key asset in bringing the LHC machine to maximum performance. A large triplet aperture allows: o Smaller β-functions at the interaction point (IP) (higher luminosity). o A larger beam separation in the common vacuum chamber of the two LHC beams (reduced long range beam-beam interactions). o More aperture margins (more room for absorbers and less heat deposition in the magnet coils from debris leaving the IP). o A larger opening of the LHC collimator jaws (reduced collimator impedance).