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Title: Beam diffusion measurements using collimator scans in the LHC
Authors: Valentino, Gianluca
Assmann, Ralph W.
Bruce, Roderik
Burkart, Florian
Previtali, Valentina
Redaelli, Stefano
Salvachua, Belen
Stancari, Giulio
Valishev, Alexander A.
Keywords: Large Hadron Collider (France and Switzerland)
Colliders (Nuclear physics)
Collimators (Optical instrument)
Issue Date: 2013
Publisher: American Physical Society
Citation: Valentino, G., Aßmann, R., Bruce, R., Burkart, F., Previtali, V., Redaelli, S.,... Valishev, A. (2013). Beam diffusion measurements using collimator scans in the LHC. Physical Review Special Topics - Accelerators and Beams, 16(2), 021003.
Abstract: The time evolution of beam losses during a collimator scan provides information on halo diffusion and population. This is an essential input for machine performance characterization and for the design of collimation systems. Beam halo measurements in the CERN Large Hadron Collider were conducted through collimator scrapings in a dedicated beam study for the first time at 4 TeV. Four scans were performed with two collimators, in the vertical plane for beam 1 and horizontally for beam 2, before and after bringing the beams into collisions. Inward and outward steps were performed. A diffusion model was used to interpret the observed loss rate evolution in response to the collimator steps. With this technique, diffusion coefficients were estimated as a function of betatron oscillation amplitude from approximately 3 to 7 standard deviations of the transverse beam distribution. A comparison of halo diffusion and core emittance growth rates is also presented.
Appears in Collections:Scholarly Works - FacICTCCE

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