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Title: Comparison of LHC collimator beam-based alignment centers to BPM-interpolated centers
Authors: Valentino, Gianluca
Wolfgang Assmann, Ralph
Bruce, Roderick
Lari, Luisella
Muller, Gabriel
Redaelli, Stefano
Rossi, Adriana
Sammut, Nicholas
Keywords: Large Hadron Collider (France and Switzerland)
Collimators (Optical instrument)
Issue Date: 2012
Publisher: CERN
Citation: Valentino, G., Wolfgang Assmann, R., Bruce, R., Lari, L., Muller, G., Redaelli, S., Rossi, A., & Sammut, Nicholas (2012). Comparison of LHC collimator beam-based alignment centers to BPM-interpolated centers. International Particle Accelerator Conference (IPAC’12), New Orleans.
Abstract: The beam centers at the Large Hadron Collider collimators are determined by beam-based alignment, where both jaws of a collimator are moved in separately until a loss spike is detected on a Beam LossMonitor downstream. Orbit drifts of more than a few hundred micrometers cannot be tolerated, as they would compromise the performance of the collimation system. Beam Position Monitors (BPMs) are installed at various locations around the LHC ring, and a linear interpolation of the orbit can be obtained at the collimator positions. In this paper, the results obtained from beam-based alignment are compared with the orbit interpolated from the BPM data throughout the 2011 and 2012 LHC proton runs.
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