Session 3: PICs and upgrade scenario 1

This document summarizes the talks and discussion which took place in the third session of the RLIUP Review. The session was devoted to Performance Improving Consolidation (thereafter PICs) and Upgrade scenario 1. The PICs were defined as the “Replacement or upgrade of a system justified by consolidation but with the goal of improving performance”. The PICs scenario goals were further defined as accumulating 70 fb-1 integrated luminosity per year over a period a 10 years of operation, reaching 1000 fb-1 (starting with an initial integrated luminosity of 300 fb-1). An ‘Upgrade’ was defined as the ‘Replacement or addition of a system to improve the performance, which would otherwise not be necessary’. The Upgrade scenario 1 goals were defined as accumulating 170 fb-1 integrated luminosity per year over a period a 10 years of operation, reaching 2000 fb-1 (starting with an initial integrated luminosity of 300 fb-1). This scenario assumed no crab cavity, no levelling, and a crossing angle adjusted for 12 sigma long range beam-beam separation. The aim of the session was to analyse which beam parameters can reach these targets and what are the related actions on the equipment. In the first part of the session, the PICs were presented and discussed for both the LIU and the HL-LHC project. This part comprised three presentations: “Injectors: PICs: what are we talking about?” by K. Hanke; “LHC: PICs: what are we talking about?’ by P. Fessia and “LIU-HLLHC: PICs: what do we gain in beam performances?” by G. Arduini. The second part of the session was devoted to the Upgrade scenario 1, with four presentations: ‘HLLHC: How to achieve Upgrade Scenario 1 goals in the LHC?’ by O. Brüning; “Work effort in the LHC accelerator for upgrade scenario 1” by E. Todesco; “LIU: Which beams in the injectors fulfil HL-LHC US1 goals?” by S. Gilardoni and “Work effort in the LHC injector complex, including Linac4 connection, for upgrade scenarios” by J.-B. Lallement and B. Mikulec.