Test of fiber optic based current sensors on the Tore Supra tokamak

Ph. Moreau; B. Brichard; A. Fil; Ph. Malard; P. Pastor; A. Le-Luyer; F. Samaille; Vincent Massaut; Andrei Goussarov

doi:10.1016/j.fusengdes.2010.12.023

Test of fiber optic based current sensors on the Tore Supra tokamak

Ph. Moreau, B. Brichard, A. Fil, Ph. Malard, P. Pastor, A. Le-Luyer, F. Samaille, Vincent Massaut, Andrei Goussarov

Research output › peer-review

Abstract

Fiberopticcurrentsensors have been recently considered for current measurements in ITER. These sensors exploit Ampere's law by measuring the change of light polarization along an optical fiber subjected to a magnetic field aligned along the fiber axis. Through collaboration between CEA and SCK·CEN, such fiberopticcurrentsensors have been installed on ToreSupratokamak as a first demonstration for possible future applications in ITER. This paper aims at reporting the results obtained on ToreSupra. It discusses the technique used to separate the effects of the intrinsic linear birefringence and the magneto-induced circular birefringence, the latter enabling the determination of the current flowing through the area defined by the opticfiber loop. Three optical fibers have been installed on ToreSupra for assessment of their linearity response on a wide range of plasma current from 0.3 to 1.4 MA as well as their long term stability. The extrapolation of the results and the issues related to a future application on ITER are finally discussed.

Original language	English
Pages (from-to)	1222-1226
Journal	fusion engineering and design
Volume	86
Issue number	6-8
DOIs	https://doi.org/10.1016/j.fusengdes.2010.12.023
State	Published - Oct 2011

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Cite this

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title = "Test of fiber optic based current sensors on the Tore Supra tokamak",

abstract = "Fiberopticcurrentsensors have been recently considered for current measurements in ITER. These sensors exploit Ampere's law by measuring the change of light polarization along an optical fiber subjected to a magnetic field aligned along the fiber axis. Through collaboration between CEA and SCK·CEN, such fiberopticcurrentsensors have been installed on ToreSupratokamak as a first demonstration for possible future applications in ITER. This paper aims at reporting the results obtained on ToreSupra. It discusses the technique used to separate the effects of the intrinsic linear birefringence and the magneto-induced circular birefringence, the latter enabling the determination of the current flowing through the area defined by the opticfiber loop. Three optical fibers have been installed on ToreSupra for assessment of their linearity response on a wide range of plasma current from 0.3 to 1.4 MA as well as their long term stability. The extrapolation of the results and the issues related to a future application on ITER are finally discussed.",

keywords = "Fiber optic current sensors, Tokamak, ITER, Measurement interpretation",

author = "Ph. Moreau and B. Brichard and A. Fil and Ph. Malard and P. Pastor and A. Le-Luyer and F. Samaille and Vincent Massaut and Andrei Goussarov",

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AU - Moreau, Ph.

AU - Brichard, B.

AU - Fil, A.

AU - Malard, Ph.

AU - Pastor, P.

AU - Le-Luyer, A.

AU - Samaille, F.

AU - Massaut, Vincent

A2 - Goussarov, Andrei

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N2 - Fiberopticcurrentsensors have been recently considered for current measurements in ITER. These sensors exploit Ampere's law by measuring the change of light polarization along an optical fiber subjected to a magnetic field aligned along the fiber axis. Through collaboration between CEA and SCK·CEN, such fiberopticcurrentsensors have been installed on ToreSupratokamak as a first demonstration for possible future applications in ITER. This paper aims at reporting the results obtained on ToreSupra. It discusses the technique used to separate the effects of the intrinsic linear birefringence and the magneto-induced circular birefringence, the latter enabling the determination of the current flowing through the area defined by the opticfiber loop. Three optical fibers have been installed on ToreSupra for assessment of their linearity response on a wide range of plasma current from 0.3 to 1.4 MA as well as their long term stability. The extrapolation of the results and the issues related to a future application on ITER are finally discussed.

AB - Fiberopticcurrentsensors have been recently considered for current measurements in ITER. These sensors exploit Ampere's law by measuring the change of light polarization along an optical fiber subjected to a magnetic field aligned along the fiber axis. Through collaboration between CEA and SCK·CEN, such fiberopticcurrentsensors have been installed on ToreSupratokamak as a first demonstration for possible future applications in ITER. This paper aims at reporting the results obtained on ToreSupra. It discusses the technique used to separate the effects of the intrinsic linear birefringence and the magneto-induced circular birefringence, the latter enabling the determination of the current flowing through the area defined by the opticfiber loop. Three optical fibers have been installed on ToreSupra for assessment of their linearity response on a wide range of plasma current from 0.3 to 1.4 MA as well as their long term stability. The extrapolation of the results and the issues related to a future application on ITER are finally discussed.

KW - Fiber optic current sensors

KW - Tokamak

KW - ITER

KW - Measurement interpretation

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