LHC IR upgrade: dipole first with chromaticity and dynamic aperture issues

A dipole first layout for the LHC interaction region upgrade, while offering a potential reduction of the limitations due the long range beam-beam collisions, charged debris with respect to the quadrupole first layout, presents an enhancement of the chromatic and geometric aberration due large values in the triplet. These two effects are studied in the following for the dipole first option presented in [1]