Title :
Fiber Bragg Grating Cryosensors for Superconducting Accelerator Magnets
Author :
Chiuchiolo, A. ; Bajko, M. ; Perez, J.C. ; Bajas, H. ; Consales, M. ; Giordano, M. ; Breglio, G. ; Cusano, A.
Author_Institution :
Dept. of Eng., Univ. of Sannio, Benevento, Italy
Abstract :
The design, fabrication, and tests of the new generation of superconducting magnets for the High Luminosity upgrade of the Large Hadron Collider (HL-LHC) require the support of an adequate sensing technology able to assure the integrity of the strain-sensitive and brittle superconducting cables through the whole service life of the magnet: assembly up to 150 MPa, cool down to 1.9 K, and powering up to about 16 kA. A precise temperature monitoring is also needed, in order to guarantee the safe working condition of the superconducting cables in the power transmission lines (SC-Link) designed to feed the magnet over long distance. Fiber Bragg Grating-based temperature and strain monitoring systems have been implemented in the first SC-Link prototype and in two subscale dipole magnets and tested in the cryogenic test facility at CERN, at 30 K, 77 K, and 1.9 K.
Keywords :
Bragg gratings; cryogenics; fibre optic sensors; power transmission lines; strain measurement; superconducting cables; superconducting magnets; temperature measurement; CERN; HL-LHC; SC-link; cryogenic test facility; fiber Bragg grating cryosensors; high luminosity upgrade; large Hadron collider; power transmission lines; strain monitoring systems; subscale dipole magnets; superconducting accelerator magnets; superconducting cables; temperature 1.9 K; temperature 30 K; temperature 77 K; temperature monitoring systems; Bragg gratings; Cryogenics; Fiber gratings; Optical fiber sensors; Strain; Superconducting magnets; Superconducting transmission lines; FBG; Fiber optic sensor; cryogenic temperatures; strain; superconducting magnet; superconducting transmission line;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2014.2343994
