In-situ displacement measurement for use in LHC collimators

Thomas Furness, James Williamson, Simon Fletcher, Ali Iqbal, Andrew Bell, Andrew Henning, Haydn Martin, Jane Jiang, Alessandro Bertarelli, Federico Carra, Michele Pasquali, Stefano Redaelli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Adaptive Collimation System (ACS) is a closed-loop control system that can monitor and correct collimator jaw straightness deviations. Key to the operation of the ACS is a fibre-based interferometric strain measurement system mounted in the jaws that can detect straightness deviations. This system utilises spectral interferometry to interrogate multiple strain sensitive intrinsic Fabry-Perot interferometer (IFPI) cavities that can detect localised thermal and vibratory deformations within the jaw structure and allow for their correction. This paper outlines the operation of the fibre-based measurement system, construction and integration challenges, both environmental and mechanical. Finally, preliminary experimental results are described which indicate the system is sufficiently sensitive to observe a second order response from a 1.5 μm first order displacement (bend) of the jaw.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology
Subtitle of host publicationEuspen 2020, Virtual Conference
EditorsR. K. Leach, D. Billington, C. Nisbet, D. Phillips
Publishereuspen
Chapter5
Pages309-312
Number of pages4
ISBN (Electronic)9780995775176
Publication statusPublished - 12 Jun 2020
Event20th International Conference of the European Society for Precision Engineering and Nanotechnology - Virtual Conference
Duration: 8 Jun 202012 Jun 2020
Conference number: 20
https://www.euspen.eu/events/vc-2020/

Conference

Conference20th International Conference of the European Society for Precision Engineering and Nanotechnology
Abbreviated titleICE20
Period8/06/2012/06/20
Internet address

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  • Cite this

    Furness, T., Williamson, J., Fletcher, S., Iqbal, A., Bell, A., Henning, A., Martin, H., Jiang, J., Bertarelli, A., Carra, F., Pasquali, M., & Redaelli, S. (2020). In-situ displacement measurement for use in LHC collimators. In R. K. Leach, D. Billington, C. Nisbet, & D. Phillips (Eds.), Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology: Euspen 2020, Virtual Conference (pp. 309-312). [P5.08] euspen.