Modal analysis of a scale model of QD0

Abstract : The last focusing magnets of the future Compact Linear Collider (CLIC) are critical elements needed to reach the desired luminosity. Designed to guide the nanometer sized focused beams, they need to be as stiff as possible to avoid any unwanted ground motion vibration amplification. Following our recent study concerning CLIC's ground motion mitigation techniques such as the active seismic isolator, the next step is to build a real scale prototype of the QD0. This mock-up is needed to validate experimentally the proposed control strategy. Such a prototype isn't yet available, hence this first study with a scale model of QD0. In this paper, modal analysis is used to analyze the dynamic characteristics of the structure of the prototype. This analysis identifies mode shapes, frequency and damping parameters. The purpose of this paper is to provide model verification by comparing experimental and theoretical modal analysis. The knowledge of these modes would later allow to validate experimentally ground motion vibration damping on that scale model of QD0, and finally on the real scale mock-up of QD0 by predicting the effect of design change.
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http://hal.in2p3.fr/in2p3-01111572
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Soumis le : vendredi 30 janvier 2015 - 15:45:11
Dernière modification le : jeudi 11 janvier 2018 - 06:13:32
Document(s) archivé(s) le : samedi 12 septembre 2015 - 07:01:51

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LAPP-TECH-2015-01.pdf
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  • HAL Id : in2p3-01111572, version 1

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G. Balik, B. Aimard, L. Brunetti, C. Hernandez-Rodriguez, Q.-A. Lopez. Modal analysis of a scale model of QD0. 2015. 〈in2p3-01111572〉

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