Abstract
ABSTRACT The luminosity upgrade of the Large Hadron Collider (HL -LHC) planned at the European Organizat ion for Nuclear Research (CERN) requires the development of a new generation of superconducting magnets based on Nb 3 Sn technology. The instrumentation required fo r the racetrack coils needs the development of reliable sensing systems able to monitor the magnet thermo -mechanical behavior during its service life, from the coil fabrication to the magnet operation. With this purpose , Fiber Bragg Grating (FBG) sensors have been embedded in the coils of the Short Model Coil (SMC) magnet fabricated at CERN . The FBG sensitivity to both temperature and strain required the development of a solution able to separate mechanical and temperature effects. This work presents for th e first time a feasibility study devoted to the implementation of an embedded FBG sensor for the measurement of the true temperature in the impregnated Nb 3 Sn coil during t he fabrication process. Keywords: Fiber Optic sensors, Fiber Bragg gratings, superc onducting magnets , Nb
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