Performance assessment of plasma current measurement at JET using fibre optics current sensor

Andrei Goussarov; Willem Leysen; P. Beaumont; Marc Wuilpart; Prasadaraju Dandu; A.lexandru Boboc; David Croft; Nicolas Bekris; Paola Batistoni

doi:10.1016/j.fusengdes.2021.112228

Performance assessment of plasma current measurement at JET using fibre optics current sensor

Andrei Goussarov, Willem Leysen, P. Beaumont, Marc Wuilpart, Prasadaraju Dandu, A.lexandru Boboc, David Croft, Nicolas Bekris, Paola Batistoni

Nuclear Engineering Office

Research output › peer-review

Abstract

The Fibre Optic Current Sensor (FOCS) is a diagnostic system to be installed in ITER to perform plasma current measurements during long plasma discharges under intense nuclear radiation. The sensor performance must be experimentally assessed at ITER representative conditions. JET is a unique machine where this task can be performed. We have installed polarisation detection based FOCS systems at JET and performed measurements in various machine operating scenarios at currents up to 3.5 MA. The frequency analysis of the data was performed to investigate the sensitivity of FOCS to mechanical perturbations. A significant part of the noise originates from the optical link between the sensing fibre and the polarisation analyser. Operation with a Faraday mirror reduces this effect. It is confirmed that the FOCS system has performance characteristics compatible with the ITER requirements.

Original language	English
Article number	112228
Pages (from-to)	1-8
Number of pages	8
Journal	Fusion Engineering & Design
Volume	165
DOIs	https://doi.org/10.1016/j.fusengdes.2021.112228
State	Published - 1 Apr 2022

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Cite this

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title = "Performance assessment of plasma current measurement at JET using fibre optics current sensor",

abstract = "The Fibre Optic Current Sensor (FOCS) is a diagnostic system to be installed in ITER to perform plasma current measurements during long plasma discharges under intense nuclear radiation. The sensor performance must be experimentally assessed at ITER representative conditions. JET is a unique machine where this task can be performed. We have installed polarisation detection based FOCS systems at JET and performed measurements in various machine operating scenarios at currents up to 3.5 MA. The frequency analysis of the data was performed to investigate the sensitivity of FOCS to mechanical perturbations. A significant part of the noise originates from the optical link between the sensing fibre and the polarisation analyser. Operation with a Faraday mirror reduces this effect. It is confirmed that the FOCS system has performance characteristics compatible with the ITER requirements.",

keywords = "JET, Plasma diagnostics, Plasma current, Fibre optics current sensor, Faraday mirror",

author = "Andrei Goussarov and Willem Leysen and P. Beaumont and Marc Wuilpart and Prasadaraju Dandu and A.lexandru Boboc and David Croft and Nicolas Bekris and Paola Batistoni",

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T1 - Performance assessment of plasma current measurement at JET using fibre optics current sensor

AU - Goussarov, Andrei

AU - Leysen, Willem

AU - Beaumont, P.

AU - Wuilpart, Marc

AU - Dandu, Prasadaraju

AU - Boboc, A.lexandru

AU - Croft, David

AU - Bekris, Nicolas

AU - Batistoni, Paola

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PY - 2022/4/1

Y1 - 2022/4/1

N2 - The Fibre Optic Current Sensor (FOCS) is a diagnostic system to be installed in ITER to perform plasma current measurements during long plasma discharges under intense nuclear radiation. The sensor performance must be experimentally assessed at ITER representative conditions. JET is a unique machine where this task can be performed. We have installed polarisation detection based FOCS systems at JET and performed measurements in various machine operating scenarios at currents up to 3.5 MA. The frequency analysis of the data was performed to investigate the sensitivity of FOCS to mechanical perturbations. A significant part of the noise originates from the optical link between the sensing fibre and the polarisation analyser. Operation with a Faraday mirror reduces this effect. It is confirmed that the FOCS system has performance characteristics compatible with the ITER requirements.

AB - The Fibre Optic Current Sensor (FOCS) is a diagnostic system to be installed in ITER to perform plasma current measurements during long plasma discharges under intense nuclear radiation. The sensor performance must be experimentally assessed at ITER representative conditions. JET is a unique machine where this task can be performed. We have installed polarisation detection based FOCS systems at JET and performed measurements in various machine operating scenarios at currents up to 3.5 MA. The frequency analysis of the data was performed to investigate the sensitivity of FOCS to mechanical perturbations. A significant part of the noise originates from the optical link between the sensing fibre and the polarisation analyser. Operation with a Faraday mirror reduces this effect. It is confirmed that the FOCS system has performance characteristics compatible with the ITER requirements.

KW - JET

KW - Plasma diagnostics

KW - Plasma current

KW - Fibre optics current sensor

KW - Faraday mirror

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/47767198

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