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Title: First operational experience with embedded collimator BPMs in the LHC
Authors: Valentino, Gianluca
Baud, Guillaume
Bruce, Roderik
Gasior, Marek
Olexa, Jakub
Redaelli, Stefano
Valloni, Alessandra
Wenninger, Jorg
Keywords: Large Hadron Collider (France and Switzerland)
Colliders (Nuclear physics)
Issue Date: 2016
Publisher: Joint Accelerator Conferences Website (JACoW)
Citation: Valentino, G., Baud, G., Bruce, R., Gasior, M., Olexa, J., Redaelli, S.,... Wenninger, J. (2016). First operational experience with embedded collimator BPMs in the LHC. 7th International Particle Accelerator Conference, Busan. 2510-2513.
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 mean that margins in the collimation hierarchy placed specifically to cater for unknown orbit drifts can be reduced, therefore increasing the beta-star and luminosity reach of the LHC. In this paper, the first operational results are presented, including a comparisonwith the standard alignment technique and a fill-to-fill analysis of the measured orbit in different machine modes in the first year of running after the shutdown.
ISBN: 9783954501472
Appears in Collections:Scholarly Works - FacICTCCE

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