30 May 2016 Study of a fibre optics current sensor for the measurement of plasma current in ITER
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99160L (2016) https://doi.org/10.1117/12.2236814
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
Abstract
In this article, we study the feasibility of using a fibre-optics current sensor (FOCS) for the measurement of plasma current in the future fusion reactor ITER. The sensor is based on a classical FOCS interrogator involving the measurement of the state of polarization rotation undergone by the light in presence of a magnetic field (Faraday effect) in an optical fibre surrounding the current and terminated by a Faraday mirror. We considered a uniformly spun optical fibre as the sensing element and we used the Stokes formalism to simulate the sensor. The objective of the simulations is to quantify the ratio LB/SP (beat length over the spun period of the spun fibre) enabling a measurement error in agreement with the ITER specifications. The simulator takes into account the temperature variations undergone by the measurement system under ITER operation. The simulation work showed that a LB/SP ratio of 19.2 is adequate.
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Marc Wuilpart, Benoit Vanus, Alina Andrasan, Andrei Gusarov, Philippe Moreau, Patrice Mégret, "Study of a fibre optics current sensor for the measurement of plasma current in ITER", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160L (30 May 2016); doi: 10.1117/12.2236814; https://doi.org/10.1117/12.2236814
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