1. Cryogenic-temperature profiling of high-power superconducting lines using local and distributed optical-fiber sensors
- Author
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Marco Consales, Andrea Galtarossa, Anna Borriello, Marta Bajko, Andrea Cusano, Hugues Bajas, Michele Giordano, Luca Palmieri, and A. Chiuchiolo
- Subjects
Cryostat ,Materials science ,Optical fiber ,Fiber optics ,sensors ,01 natural sciences ,epoxy ,law.invention ,010309 optics ,symbols.namesake ,Optics ,Fiber Bragg grating ,law ,Transmission line ,0103 physical sciences ,Rayleigh scattering ,010306 general physics ,Reflectometry ,Superconductivity ,Power transmission ,poly methyl methacrylate ,business.industry ,MagNet@CERN [9.2] ,Accelerators and Storage Rings ,Atomic and Molecular Physics, and Optics ,symbols ,HiRadMat@SPS and MagNet@CERN [9] ,business - 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. (C) 2015 Optical Society of America
- Published
- 2015
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