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TY - CONF AU - Guinchard, M. AU - Cabon, M. AU - Charrondière, C. AU - Develle, K. AU - Fessia, P. AU - Lacny, L.L. AU - Osborne, J.A. AU - Scislo, L.S. AU - Wenninger, J. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Investigation and Estimation of the LHC Magnet Vibrations Induced by HL-LHC Civil Engineering Activities J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - HL-LHC requires the excavation of large underground infrastructures in order to host new equipment. The tunnel shall be ready for installation for LS3 (2022) and therefore its construction shall take in place in parallel with the LHC exploitation. Effect of vibrations induced by civil engineering activities need to be evaluated in order to take required corrective actions. For this purpose, several diverse measurements and experiments have been performed in order to estimate the vibration sources and determine the vibration transfer path through the floor and the structure. The transfer functions from amplitude and phase point of view were determined through molasses rock, for both horizontal and vertical vibrations, with dedicated tools and Experimental Modal Analysis was carried out on mechanical structure. The campaign of measurements have been used to confirm the effect of the surface induced vibration on the circulating beam orbit at the resonance frequencies of the structure. This paper reviews the advanced technique of measurements, results and the conclusion about the impact of operating civil engineering machines (road header, hydraulic hammer) during beam exploitation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2568 EP - 2571 KW - civil-engineering KW - network KW - operation KW - experiment KW - monitoring DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-WEPMF080 UR - http://jacow.org/ipac2018/papers/wepmf080.pdf ER -