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Measurement of Underground Variations in the Deflection of the Vertical with a High Precision Interferometric Deflectometer

  • Sébastien Guillaume
  • Mark Jones
  • Beat Bürki
  • Alain Geiger
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 139)

Abstract

A new system for measuring underground variations of the deflection of the vertical is presented. Based on geodetic and interferometric tilt measurements along a profile, it is designed to finally determine variations of equipotential profiles to better than 10 μm over 200 m with respect to a straight line. This condition comes from the pre-alignment constraints for the Compact Linear Collider (CLIC; Schulte, Pre-Alignment Needs for CLIC, 2009).In the first part of this paper, the basic principle is described and a mathematical model of the system is developed in order to estimate, using Monte-Carlo simulations, theoretical precisions achievable by the system in various configurations. In the second part, the first 12 m long prototype, designed and assembled at the European Organization for Nuclear Research (CERN) in Geneva, is presented. From the first experiments, it is not yet possible to validate the concept, nevertheless they permit us to identify the weaknesses which have to be solved in order to achieve the performance anticipated.

Keywords

Accelerator Alignment CLIC Gravity Field Deflection of the Vertical Tiltmeter Angular Interferometer 

References

  1. Guillaume S et al (2013) Determination of high precision underground equipotential profiles for the alignment of a future linear collider. In: Rizos C, Willis P (eds) Earth on the edge: science for a sustainable Planet. Springer, HeidelbergGoogle Scholar
  2. Hirt C (2008) Hochauflösende astrogeodätische Bestimmung von Geoid- und Aequipotentialprofilen mit Submillimetergenauigkeit fr die Vermessung von Teilchenbeschleunigern. AVN Allgemeine Vermessungs-Nachrichten 10/2008Google Scholar
  3. Schulte D (2009) Pre-Alignment Needs for CLIC. In: CLIC Prealignment Workshop 2009, CERN, Geneva, SwitzerlandGoogle Scholar
  4. Welsch et al (2000) Auswertung geodätischer Überwachungsmessungen. WichmannGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Sébastien Guillaume
    • 1
  • Mark Jones
    • 2
  • Beat Bürki
    • 1
  • Alain Geiger
    • 1
  1. 1.Institute for Geodesy and PhotogrammetryETH ZürichZürichSwitzerland
  2. 2.European Organization for Nuclear ResearchCERNZürichSwitzerland

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