Electron Lenses for the Large Hadron Collider (original) (raw)

Electron lenses are pulsed, magnetically confined electronbeamswhosecurrent-densityprofileisshapedtoobtain the desired effect on the circulating beam. Electron lenses were used in the Fermilab Tevatron collider for bunch-bybunch compensation of long-range beam-beam tune shifts, for removal of uncaptured particles in the abort gap, for preliminaryexperimentsonhead-onbeam-beamcompensation, andforthedemonstrationofhaloscrapingwith hollow electron beams. Electron lenses for beam-beam compensation are being commissioned in RHIC at BNL. Within the US LHC Accelerator Research Program and the European HiLumi LHC Design Study, hollow electron beam collimationwasstudiedasanoptiontocomplementthecollimation system for the LHC upgrades. A conceptual design was recently completed, and the project is moving towards a technical design in 2014–2015 for construction in 2015–2017, if needed, after resuming LHC operations and re-assessing collimation needs and requirements at 6.5 TeV. Because of their ...

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