At CERN, an option of installing Hollow Electron Lenses for HL-LHC is being studied. Full details in Accelerating News | Issue #28.
Electron Lens Test Stand at CERN
Electron Lens Test Stand at CERN
Electron Lens Test Stand at CERN
Hollow Electron Beam around the circulated beam (left hand side) and schematics of the Collimation Scheme for HL-LHC (right hand side). (Courtesy of Stefano Redaelli, CERN)