Speaker
Description
Experimental observations indicate that a significant fraction of the stored beam energy in the CERN Large Hadron Collider (LHC) is contained in the transverse beam halo. Combined with the anticipated increase in beam brightness in the High-Luminosity LHC (HL-LHC) and new expected fast failure scenarios resulting in a loss of large-amplitude particles, an overpopulated beam halo poses risk to the safe operation of the machine. Following removal from the HL-LHC baseline of the Hollow Electron Lens, which was studied as the preferred method for active halo control, alternative halo-cleaning methods need to be investigated. A novel method being explored is the use of an AC multipole operated in resonance with the betatron tune to create a stable island in phase space in which halo particles are adiabatically trapped and transported to the collimators in a controlled manner. This paper presents the results of the first successful proof-of-principle measurement of both controlled beam-halo population and cleaning using an AC dipole at the LHC.
Funding Agency
Work supported by the Wolfgang Gentner Programme of the German Federal Ministry of Education and Research (grant no. 13E18CHA).
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