Development of a displacement sensor for the CERN-LHC superconducting cryo-dipoles

Daniele Inaudi, Branko Glisic, Sirine Fakra, Walter Scandale, Juan Garcia Perez, Jaques Billan

Research output: Contribution to journalConference articlepeer-review


All evidence indicates that new physics, and answers to some of the most profound scientific questions of our time, lie at energies around 1 TeV. To look for this new physics, the next research instrument in Europe's particle physics armory is the Large Hadron Collider (LHC). This challenging machine will use the most advanced superconducting magnet and accelerator technologies ever employed. LHC experiments are being designed to look for theoretically predicted phenomena. One or the main challenges in this new machine resides in the design and production of the superconducting dipoles used to steer the particles around the 27 km underground tunnel. These so-called cryodipoles are composed of an external vacuum tube and an insert, appropriately named the cold mass, that contains the particle tubes, the superconducting coil and will be cooled using superfluid Helium to 1.9 K. The particle beam must be placed inside the magnetic field with a sub-millimeter accuracy, this requires in turn that the relative displacements between the vacuum tube and the cold-mass must be monitored with accuracy. Due to the extreme condition environmental conditions (the displacement measurement must be made in vacuum and between two points with a temperature difference of more than 200°C) no adequate existing monitoring system was found for this application. It was therefore decided to develop an optical sensor suitable for this application. This contribution describes the development of this novel sensor and the first measurements performed on the LHC cryodipoles.

Original languageEnglish (US)
Pages (from-to)29-32
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2000
Externally publishedYes
Event14th International Conference on Optical Fiber Sensors - Venice, Italy
Duration: Oct 11 2000Oct 13 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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