Beam Dynamics and Interaction Regions for the LHeC and HL-LHC

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Abstract

The Large Hadron Electron Collider (LHeC) is a proposal for a TeV scale, 10^33 cm^−2 s^−1 luminosity electron-proton collider at CERN. In the proposal, an electron accelerator collides a beam of electrons with one of the Large Hadron Collider (LHC) proton beams at one LHC interaction point (IP). At the time of writing, the project has been approved as part of the CERN mid-term plan.The LHeC project is planned for the 2020s, around the time of the High Luminosity LHC (HL-LHC) upgrade. The LHeC thus depends upon the success of the HL-LHC project, which plans to deliver p-p luminosity of L=5×10^34 cm^−2 s^−1. Unique challenges are presented by the LHeC, particularly by the interaction region (IR) and long straight section (LSS), and constraints must be considered from beam, particle and detector physics and engineering.This thesis presents the study and design of a complete collision insertion solution for a ring-ring LHeC. This provides a solution at a conceptual level to the problem of delivering TeV scale e−p collisions at L∼10^33 cm^−2 s^−1 for the first time, with detector coverage within 1 degree of the beam. This high acceptance, high luminosity solution substantially increases the value of the project, allowing high statistics across an unprecedented kinematic range.Further studies are presented into optimising the optical flexibility of the LHC LSSs, and into the effects of fringe fields in the HL-LHC large aperture quadrupoles. Modifications are proposed which maximise LSS flexibility, and fringe effects are found to be significant but manageable.

Keyword(s)

HL-LHC; LHC; LHeC; accelerator physics

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