Title: The design of the ILD forward region,
Abstract: Following the decision to reduce the L* from 4.4 m to 4.1 m, the BeamCal had
to be moved closer to the interaction point. Results of a study of how this
affects the beamstrahlung and backward scattering backgrounds show that the
e+e- pair background depositions from beamstrahlung at the BeamCal rises by
20%. The background from backscattered electrons and positrons in the inner
pixel layers rises almost by a factor two, so does the number of photons in the
tracker.