Preliminary Design Study of the Hollow Electron Lens for LHC

TL;DR

This paper presents a preliminary design study of a Hollow Electron Lens for the LHC, focusing on magnetic field configuration, electron trajectory estimation, and mechanical design considerations to improve halo control in the HL-LHC upgrade.

Contribution

It provides an initial design framework for the HEL, including magnetic field analysis and mechanical component choices, serving as a basis for future detailed development.

Findings

Magnetic field configurations for electron guidance are defined.

Electron trajectories are estimated using a dedicated MATLAB tool.

Mechanical design choices for key components are discussed.

Abstract

A Hollow Electron Lens (HEL) has been proposed in order to improve performance of halo control and collimation in the Large Hadron Collider in view of its High Luminosity upgrade (HL-LHC). The concept is based on a beam of electrons that travels around the protons for a few meters. The electron beam is produced by a cathode and then guided by a strong magnetic field generated by a set of superconducting solenoids. The first step of the design is the definition of the magnetic fields that drive the electron trajectories. The estimation of such trajectories by means of a dedicated MATLAB tool is presented. The influence of the main geometrical and electrical parameters are analysed and discussed. Then, the main mechanical design choices for the solenoids, cryostats gun and collector are described. The aim of this paper is to provide an overview of the preliminary design of the Electron Lens for LHC. The methods used in this study also serve as examples for future mechanical and integration designs of similar devices.