Simulation of vibration-induced effect on plasma current measurement using a fiber optic current sensor

Frédéric Descamps; Matthieu Aerssens; Andrei Goussarov; Patrice Mégret; Vincent Massaut; Marc Wuilpart

doi:10.1364/OE.22.014666

Simulation of vibration-induced effect on plasma current measurement using a fiber optic current sensor

Frédéric Descamps, Matthieu Aerssens, Andrei Goussarov, Patrice Mégret, Vincent Massaut, Marc Wuilpart

Research output › peer-review

13 Scopus citations

Abstract

An accurate measurement of the plasma current is of paramount importance for controlling the plasma magnetic equilibrium in tokamaks. Fiber optic current sensor (FOCS) technology is expected to be implemented to perform this task in ITER. However, during ITER operation, the vessel and the sensing fiber will be subject to vibrations and thus to time-dependent parasitic birefringence, which may significantly compromise the FOCS performance. In this paper we investigate the effects of vibrations on the plasma current measurement accuracy under ITER-relevant conditions. The simulation results show that in the case of a FOCS reflection scheme including a spun fiber and a Faraday mirror, the error induced by the vibrations is acceptable regarding the ITER current diagnostics requirements.

Original language	English
Pages (from-to)	14666-14680
Number of pages	15
Journal	Optics Express
Volume	22
Issue number	12
DOIs	https://doi.org/10.1364/OE.22.014666
State	Published - 16 Jun 2014

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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Cite this

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title = "Simulation of vibration-induced effect on plasma current measurement using a fiber optic current sensor",

abstract = "An accurate measurement of the plasma current is of paramount importance for controlling the plasma magnetic equilibrium in tokamaks. Fiber optic current sensor (FOCS) technology is expected to be implemented to perform this task in ITER. However, during ITER operation, the vessel and the sensing fiber will be subject to vibrations and thus to time-dependent parasitic birefringence, which may significantly compromise the FOCS performance. In this paper we investigate the effects of vibrations on the plasma current measurement accuracy under ITER-relevant conditions. The simulation results show that in the case of a FOCS reflection scheme including a spun fiber and a Faraday mirror, the error induced by the vibrations is acceptable regarding the ITER current diagnostics requirements.",

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AU - Descamps, Frédéric

AU - Aerssens, Matthieu

AU - Goussarov, Andrei

AU - Mégret, Patrice

AU - Massaut, Vincent

AU - Wuilpart, Marc

PY - 2014/6/16

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AB - An accurate measurement of the plasma current is of paramount importance for controlling the plasma magnetic equilibrium in tokamaks. Fiber optic current sensor (FOCS) technology is expected to be implemented to perform this task in ITER. However, during ITER operation, the vessel and the sensing fiber will be subject to vibrations and thus to time-dependent parasitic birefringence, which may significantly compromise the FOCS performance. In this paper we investigate the effects of vibrations on the plasma current measurement accuracy under ITER-relevant conditions. The simulation results show that in the case of a FOCS reflection scheme including a spun fiber and a Faraday mirror, the error induced by the vibrations is acceptable regarding the ITER current diagnostics requirements.

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