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Titolo:
Development of a displacement sensor for the CERN-LHC superconducting cryodipoles
Autore:
Inaudi, D; Glisic, B; Fakra, S; Billan, J; Perez, JG; Redaelli, S; Scandale, W;
Indirizzi:
SMARTEC SA, CH-9616 Grancia, Switzerland SMARTEC SA Grancia Switzerland CH-9616 SA, CH-9616 Grancia, Switzerland Swiss Fed Inst Technol, EPFL, Stress Anal Lab, IMAC, CH-1015 Lausanne, Switzerland Swiss Fed Inst Technol Lausanne Switzerland CH-1015 ausanne, Switzerland CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland CERN Geneva Switzerland CH-1211 rg Nucl Res, CH-1211 Geneva, Switzerland
Titolo Testata:
MEASUREMENT SCIENCE & TECHNOLOGY
fascicolo: 7, volume: 12, anno: 2001,
pagine: 887 - 896
SICI:
0957-0233(200107)12:7<887:DOADSF>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
COHERENCE;
Keywords:
displacement; distance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Inaudi, D SMARTEC SA, Via Mulino 6, CH-9616 Grancia, Switzerland SMARTEC SA Via Mulino 6 Grancia Switzerland CH-9616 Switzerland
Citazione:
D. Inaudi et al., "Development of a displacement sensor for the CERN-LHC superconducting cryodipoles", MEAS SCI T, 12(7), 2001, pp. 887-896

Abstract

One of the main challenges of the Large Hadron Collider (LHC), a new particle accelerator currently under construction at CERN (the European Organization for Nuclear Research) in Geneva, resides in the design and production of the superconducting dipoles used to steer the particles around a 27 km underground tunnel. These so-called cryodipoles consist of an evacuated cryostat and a cold mass containing the particle tubes and the superconducting dipole magnet. The latter is cooled by superfluid helium at 1.9 K. The particle beams must be centred in the dipole magnetic field with a sub-millimetre accuracy. This requires that the relative displacements between the cryostat and the cold mass must be monitored with great accuracy. Because of the extreme environmental conditions (the displacement measurements must be made in vacuum and between two points at a temperature difference of about 300 degrees) no adequate existing monitoring system was found for this application. It was therefore decided to develop an optical sensorbased on low-coherence double interferometry, which measures with micrometer precision the distance between a mirror welded to the dipole cold mass and an optical head attached in the inner wall of the cryostat. This contribution describes the development of this novel sensor and the first measurements performed on the LHC cryodipoles.

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Documento generato il 27/11/20 alle ore 02:12:05