Study of a fibre optics current sensor for the measurement of plasma current in ITER

Marc Wuilpart; Benoit Vanus; Alina Andrasan; Andrei Gusarov; Philippe Moreau; Patrice Mégret

doi:10.1117/12.2236814

30 May 2016 Study of a fibre optics current sensor for the measurement of plasma current in ITER

Marc Wuilpart, Benoit Vanus, Alina Andrasan, Andrei Gusarov, Philippe Moreau, Patrice Mégret

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 L_B/S_P (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 L_B/S_P ratio of 19.2 is adequate.

Citation Download Citation

Marc Wuilpart, Benoit Vanus, Alina Andrasan, Andrei Gusarov, Philippe Moreau, and 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); https://doi.org/10.1117/12.2236814

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