Abstract
The hollow electron lens (e-lens) is a very powerful and advanced tool for active control of diffusion speed of halo particles in hadron colliders. Thus, it can be used for a controlled depletion of beam tails and enhanced beam halo collimation. This is of particular interest in view of the upgrade of the Large Hadron Collider (LHC) at CERN, in the framework of the High-Luminosity LHC project (HL-LHC). The estimated stored energy in the tails of the HL-LHC beams is about 30 MJ, posing serious constraints on its control and safe disposal. In particular, orbit jitter can cause significant loss spikes on primary collimators, which can lead to accidental beam bump and magnet quench. Successful tests of e-lens assisted collimation have been carried out at the Tevatron collider at Fermilab and a review of the main outcomes is shown. Preliminary results of recent experiments performed at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven, put in place to explore different operational scenarios studies for the HL-LHC, are also discussed. Status and plans for the deployment of hollow electron lenses at the HL-LHC are presented.
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