Effect of Faraday mirror imperfections in a fiber optic current sensor dedicated to ITER

Dogus  Karabulut; Anton Miazin; Andrei Goussarov; Philippe Moreau; Willem Leysen; Patrice Mégret; Marc Wuilpart

doi:10.1016/j.fusengdes.2018.11.011

Effect of Faraday mirror imperfections in a fiber optic current sensor dedicated to ITER

Dogus Karabulut, Anton Miazin, Andrei Goussarov, Philippe Moreau, Willem Leysen, Patrice Mégret, Marc Wuilpart

Research output › peer-review

Abstract

Plasma current measurements in ITER are safety-related and must therefore satisfy a very demanding specification. In this paper, the use of the Fiber Optics Current Sensor (FOCS) operating in the reflection mode with a Faraday mirror to perform plasma current measurements is analyzed. Based on the Jones matrix formalism, we performed numerical simulations to investigate the impact of the Faraday mirror detuning on the measurement accuracy. We show that the use of standard commercial components does not allow to satisfy the ITER requirements for the whole plasma current range. A simple solution to the problem is proposed, which consists in taking into account a mirror calibration in the current estimator. We show that the achievable mirror calibration accuracy is sufficient to fulfill the ITER requirements.

Original language	English
Pages (from-to)	48-52
Number of pages	5
Journal	Fusion Engineering & Design
DOIs	https://doi.org/10.1016/j.fusengdes.2018.11.011
State	Published - Jan 2019

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Cite this

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title = "Effect of Faraday mirror imperfections in a fiber optic current sensor dedicated to ITER",

abstract = "Plasma current measurements in ITER are safety-related and must therefore satisfy a very demanding specification. In this paper, the use of the Fiber Optics Current Sensor (FOCS) operating in the reflection mode with a Faraday mirror to perform plasma current measurements is analyzed. Based on the Jones matrix formalism, we performed numerical simulations to investigate the impact of the Faraday mirror detuning on the measurement accuracy. We show that the use of standard commercial components does not allow to satisfy the ITER requirements for the whole plasma current range. A simple solution to the problem is proposed, which consists in taking into account a mirror calibration in the current estimator. We show that the achievable mirror calibration accuracy is sufficient to fulfill the ITER requirements.",

keywords = "Fiber optics current sensors, Polarimetric sensors, Plasma diagnosis",

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AU - Karabulut, Dogus

AU - Miazin, Anton

AU - Goussarov, Andrei

AU - Moreau, Philippe

AU - Leysen, Willem

AU - Mégret, Patrice

AU - Wuilpart, Marc

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AB - Plasma current measurements in ITER are safety-related and must therefore satisfy a very demanding specification. In this paper, the use of the Fiber Optics Current Sensor (FOCS) operating in the reflection mode with a Faraday mirror to perform plasma current measurements is analyzed. Based on the Jones matrix formalism, we performed numerical simulations to investigate the impact of the Faraday mirror detuning on the measurement accuracy. We show that the use of standard commercial components does not allow to satisfy the ITER requirements for the whole plasma current range. A simple solution to the problem is proposed, which consists in taking into account a mirror calibration in the current estimator. We show that the achievable mirror calibration accuracy is sufficient to fulfill the ITER requirements.

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