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Définition d'un réseau de référence métrologique pour le positionnement d'un grand accélérateur linéaire

Abstract : This PhD thesis is a study of the Compact Linear Collider (CLIC) alignment system, a project of linear accelerator of about 30km long of the European Organization for Nuclear Research (CERN). The pre-alignment tolerance on the transverse positions of the components of the CLIC linacs is typically ten microns over distances of 200 m.
This research is a consequence of 10 years work, where several sets of special sensors dedicated to metrology have been adapted for the CLIC project. Most of these sensors deliver measurements linked to geometric references sensitive to gravity fluctuation. An important part of this work is therefore dedicated to study the gravity disruptions as a high level of accuracy is required. The parameters to take into account in the use of the hydrostatic leveling have thus been highlighted.
A proposal of configuration of the system alignment based on a selection of sensors has also been given in this research. Computer models of different possible configurations have been presented. As the existing computing software was inappropriate, a new object oriented software package has been developed, to ensure future upgrades. An optimized configuration of the network has been defined from a set of simulations.
Finally, due to problems in the use of hydrostatic leveling systems, a solution based on the use of a long laser beam as an alternative solution is discussed.
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Contributor : Caroline Jusserand <>
Submitted on : Monday, May 26, 2008 - 10:25:25 AM
Last modification on : Wednesday, December 12, 2018 - 3:23:36 PM
Long-term archiving on: : Friday, May 28, 2010 - 8:08:10 PM


  • HAL Id : tel-00281959, version 1


Freddy Becker. Définition d'un réseau de référence métrologique pour le positionnement d'un grand accélérateur linéaire. Sciences de l'ingénieur [physics]. INSA de Strasbourg, 2003. Français. ⟨tel-00281959⟩



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