Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/28823
Title: Final implementation, commissioning, and performance of embedded collimator beam position monitors in the Large Hadron Collider
Authors: Valentino, Gianluca
Baud, Guillaume
Bruce, Roderik
Gasior, Marek
Mereghetti, Alessio
Mirarchi, Daniele
Olexa, Jakub
Redaelli, Stefano
Salvachua, Belen
Valloni, Alessandra
Wenninger, Jorg
Keywords: Large Hadron Collider (France and Switzerland)
Colliders (Nuclear physics)
Collimators (Optical instrument) -- Calibration
Issue Date: 2017
Publisher: American Physical Society
Citation: Valentino, G., Baud, G., Bruce, R., Gasior, M., Mereghetti, A., Mirarchi, D., ... & Wenninger, J. (2017). Final implementation, commissioning, and performance of embedded collimator beam position monitors in the Large Hadron Collider. Physical Review Accelerators and Beams, 20(8), 1-13.
Abstract: During Long Shutdown 1, 18 Large Hadron Collider (LHC) collimators were replaced with a new design, in which beam position monitor (BPM) pick-up buttons are embedded in the collimator jaws. The BPMs provide a direct measurement of the beam orbit at the collimators, and therefore can be used to align the collimators more quickly than using the standard technique which relies on feedback from beam losses. Online orbit measurements also allow for reducing operational margins in the collimation hierarchy placed specifically to cater for unknown orbit drifts, therefore decreasing the β and increasing the luminosity reach of the LHC. In this paper, the results from the commissioning of the embedded BPMs in the LHC are presented. The data acquisition and control software architectures are reviewed. A comparison with the standard alignment technique is provided, together with a fill-to-fill analysis of the measured orbit in different machine modes, which will also be used to determine suitable beam interlocks for a tighter collimation hierarchy.
URI: https://www.um.edu.mt/library/oar//handle/123456789/28823
Appears in Collections:Scholarly Works - FacICTCCE



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