- 4-IP Lattice for new layout PA31-1.0 with 91km circumference. - Phase advance of arc cells changed to 90/90. - 4 RF sections installed in 2.1km long straight sections. More information in this presentation https://indico.cern.ch/event/1085318/contributions/4582685/subcontributions/356824/attachments/2354474/4018133/Optics_since_CDR_Oide_211129.pdf