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Electron lenses at the LHC (A. Rossi & S. Sadovich - CERN, Switzerland)

Part 1 - Hollow Electron Lenses at the CERN Large Hadron Collider
Dr. Adriana Rossi

This talk will give a rapid overview on CERN and its Large Hadron Collider and will describe how it is envisaged to use Hollow Electron Lenses for active control of the hadron population in the beam tails.
Proton and ion beams are accelerated in progressively larger linear and circular accelerators, and finally brought to collision in the Large Hadron Collider, where four detectors. The beam tails are more populated than a simple Gaussian distribution and can store up to tens of MJ energy, making the beam hazardous in case of beam jitter or orbit shifts.  Hollow electron lenses produce an annular-shaped electron beam that can be used to enhance the performance of collimation systems in high-intensity and high-energy hadron colliders. If transversally overlapped to the hadron beam, a perfect hollow electron beam pushes halo particles towards large amplitudes while leaving the core unperturbed. After successful tests in past colliders, this technique will be deployed at the CERN High-Luminosity Large Hadron Collider (HL-LHC) to enhance the performance of the collimation system.
Part 2 - Electron beam diagnostics in electron lenses
Sergey Sadovich

Hollow Electron Lenses are going to be deployed at the Large Hardron Collider (CERN) as active control of the hadron population in the beam tails, via interaction with hollow electron beams. This talk will describe the electron beam (non-neutral plasma) dynamics within an electron lens and will propose a non-invasive diagnostic tool to measure energy, current density distribution and position of the electron beam. The study of such a  diagnostics will include simulating the beam dynamics and the evolution of the signal induced in the electrodes using the Particle-In-Cell (PIC) computer code SMILEI, including the time transient of electromagnetic field when switching the electron beam on and off. A prototype will be characterized at the e-lens test stand at CERN, hereby described.


Salle de conférences LULI - EP, bâtiment 84 - 14:00