Overview of EIR design options: Deliverable D3.1

This document describes the options of EIR design and collider layouts to be considered for further detailed studies. We primarily focus on factors leading to selection of the optimal L* parameter, describe the options considered and the presently selected value, as well as possible further optimization. We also describe studies performed with the present EIR optics, such as orbit correction, muon cross-talk between interaction regions, impact of synchrotron radiation as well as beam-beam effects.