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Title: Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment
Authors: Valentino, Gianluca
Nosych, Andriy A.
Bruce, Roderik
Gasior, Marek
Mirarchi, Daniele
Redaelli, Stefano
Salvachua, Belen
Wollmann, Daniel
Keywords: Large Hadron Collider (France and Switzerland)
Proton beams -- Measurement
Proton synchrotron colliders
Colliders (Nuclear physics)
Collimators (Optical instrument)
Issue Date: 2014
Publisher: American Physical Society
Citation: Valentino, G., Nosych, A. A., Bruce, R., Gasior, M., Mirarchi, D., Redaelli, S.,... Wollmann, D. (2014). Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment. Physical Review Special Topics - Accelerators and Beams, 17(2), 021005.
Abstract: Collimators with embedded beam position monitor (BPM) button electrodes will be installed in the Large Hadron Collider (LHC) during the current long shutdown period. For the subsequent operation, BPMs will allow the collimator jaws to be kept centered around the beam orbit. In this manner, a better beam cleaning efficiency and machine protection can be provided at unprecedented higher beam energies and intensities. A collimator alignment algorithm is proposed to center the jaws automatically around the beam. The algorithm is based on successive approximation and takes into account a correction of the nonlinear BPM sensitivity to beam displacement and an asymmetry of the electronic channels processing the BPM electrode signals. A software implementation was tested with a prototype collimator in the Super Proton Synchrotron. This paper presents results of the tests along with some considerations for eventual operation in the LHC.
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