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Title: Development and beam tests of an automatic algorithm for alignment of LHC collimators with embedded BPMs
Authors: Valentino, Gianluca
Bruce, Roderik
Gasior, Marek
Mirarchi, Daniele
Nosych, Andriy A.
Redaelli, Stefano
Salvachua, Belen
Sammut, Nicholas
Keywords: Large Hadron Collider (France and Switzerland)
Collimators (Optical instrument) -- Calibration
Issue Date: 2013
Publisher: JACoW
Citation: Valentino, G., Bruce, R., Gasior, M., Mirarchi, D., Nosych, A., Redaelli, S., Salvachua, B., Sammut, N. (2013). Development and beam tests of an automatic algorithm for alignment of LHC collimators with embedded BPMs. International Particle Accelerator Conference (IPAC’13), Shanghai. 3439-3441.
Abstract: Collimators with embedded Beam Position Monitor (BPM) buttons will be installed in the LHC during the upcoming long shutdown period. During the subsequent operation, the BPMs will allow the collimator jaws to be kept centered around the beam trajectory. In this manner, the best possible 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, as the BPM measurements are affected by non-linearities, which vary with the distance between opposite buttons, as well as the difference between the beam and the jaw centers. The successful test results, as well as some considerations for eventual operation in the LHC are also presented.
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