Study of the IR2 and IR8 Squeezeability for HL-LHC Upgrade Project

The paper presents the results of the study of different optics configurations of the long straight sections (IR2 and IR8) which allow to reach smaller beta functions at the IP2 and IP8 in the framework of the HL-LHC project[1]. The variants at collision energies must be compatible with the Achromatic Telescopic Squeezing (ATS)[2] scheme which provides small beta functions at the IP1 and IP5 or provide low beta functions for Alice and LHCb during ion operations. The ones at injection must satisfy injection transfer lines and aperture constraints. The final goal is to find the overlap between the phase advances of all the configurations for IR2 and IR8 respectively, in order to maintain the LHC working point without rematching the remaining insertions or the arcs.