title: Cryogenic-temperature profiling of high-power superconducting lines using local and distributed optical-fiber sensors.
abstract: This contribution presents distributed and multipoint fiber-optic monitoring of cryogenic temperatures along a superconducting power transmission line down to 30 K and over 20 m distance. Multipoint measurements were conducted using fiber Bragg gratings sensors coated with two different functional overlays (epoxy and poly methyl methacrylate (PMMA)) demonstrating cryogenic operation in the range 300-4.2 K. Distributed measurements exploited optical frequency-domain reflectometry to analyze the Rayleigh scattering along two concatenated fibers with different coatings (acrylate and polyimide). The integrated system has been placed along the 20 m long cryostat of a superconducting power transmission line, which is currently being tested at the European Organization for Nuclear Research (CERN). Cool-down events from 300-30 K have been successfully measured in space and time, confirming the viability of these approaches to the monitoring of cryogenic temperatures along a superconducting transmission line.
authors.forename: Antonella
authors.initials: A
authors.lastname: Chiuchiolo
authors.forename: Luca
authors.initials: L
authors.lastname: Palmieri
authors.forename: Marco
authors.initials: M
authors.lastname: Consales
authors.forename: Michele
authors.initials: M
authors.lastname: Giordano
authors.forename: Anna
authors.initials: A
authors.lastname: Borriello
authors.forename: Hugues
authors.initials: H
authors.lastname: Bajas
authors.forename: Andrea
authors.initials: A
authors.lastname: Galtarossa
authors.forename: Marta
authors.initials: M
authors.lastname: Bajko
authors.forename: Andrea
authors.initials: A
authors.lastname: Cusano