Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 29, Issue 6, Pages 547-550Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2017.2668765
Keywords
Fiber optics current sensors; polarisation optical-time domain reflectometer; Faraday effect; fusion
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In this letter, we present a fiber-optic current sensor for the measurement of plasma current in thermonuclear fusion reactors. The sensor includes a low-birefringence optical fiber placed around a section of the vacuum vessel that hosts the fusion reaction. The interrogating unit consists of a polarization-sensitive photon-counting optical time domain reflectometer that enables to determine the light polarization rotation induced by the plasma current. The measurement principle is demonstrated by means of the Jones formalism. The sensor has been experimentally validated on the Tore Supra tokamak fusion reactor for a plasma current range going from 0.6 to 1.5 MA. A maximum error of 13.50% has been observed for the lowest current.
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