Assessment of the environmental effects on the ITER FOCS operating in reflective scheme with Faraday mirror

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Assessment of the environmental effects on the ITER FOCS operating in reflective scheme with Faraday mirror. / Leysen, Willem; Goussarov, Andrei; Mégret, Patrice; Wuilpart, Marc.

In: Fusion Engineering & Design, Vol. 146, No. A, 01.09.2019, p. 805-808.

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Leysen, Willem ; Goussarov, Andrei ; Mégret, Patrice ; Wuilpart, Marc. / Assessment of the environmental effects on the ITER FOCS operating in reflective scheme with Faraday mirror. In: Fusion Engineering & Design. 2019 ; Vol. 146, No. A. pp. 805-808.

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@article{5b84d62c72154b5b92fbddbb5a1cb9f8,
title = "Assessment of the environmental effects on the ITER FOCS operating in reflective scheme with Faraday mirror",
abstract = "Plasma current measurements will play an important role in ITER to provide real-time plasma control and machine protection. Performance of standard electromagnetic sensors may be not sufficient to fulfill this task due to a combined effect of steady-state operation and the presence of strong nuclear radiation. The Fiber Optics Current Sensor (FOCS) is a back-up system included in the ITER design. Faraday mirror (FM) can be a part of the FOCS, which allows to improve the system performance. It is required that the polarization rotation angle is equal to 90° with acceptable deviations below 0.3°. We have experimentally investigated the effect of thermal perturbations and gamma-radiation on the rotation angle of commercial FMs. The FM rotation thermal sensitivity was found to be in a range 0.105 – 0.124°/°C. Gamma-irradiation resulted in a 1.2° change, saturated after a 12.5 kGy dose. Based on these results we conclude that the cubical area is the preferable location for the FMdespite that implies placing additional link fibers to reach the ITER vacuum Vessel.",
keywords = "ITER, Radiation effects, Magnetic diagnostics, Plasma current measurements, Fiber optics current sensor, Faraday mirror",
author = "Willem Leysen and Andrei Goussarov and Patrice M{\'e}gret and Marc Wuilpart",
note = "Score=10",
year = "2019",
month = "9",
day = "1",
doi = "10.1016/j.fusengdes.2019.01.086",
language = "English",
volume = "146",
pages = "805--808",
journal = "Fusion Engineering & Design",
issn = "0920-3796",
publisher = "Elsevier",
number = "A",

}

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TY - JOUR

T1 - Assessment of the environmental effects on the ITER FOCS operating in reflective scheme with Faraday mirror

AU - Leysen, Willem

AU - Goussarov, Andrei

AU - Mégret, Patrice

AU - Wuilpart, Marc

N1 - Score=10

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Plasma current measurements will play an important role in ITER to provide real-time plasma control and machine protection. Performance of standard electromagnetic sensors may be not sufficient to fulfill this task due to a combined effect of steady-state operation and the presence of strong nuclear radiation. The Fiber Optics Current Sensor (FOCS) is a back-up system included in the ITER design. Faraday mirror (FM) can be a part of the FOCS, which allows to improve the system performance. It is required that the polarization rotation angle is equal to 90° with acceptable deviations below 0.3°. We have experimentally investigated the effect of thermal perturbations and gamma-radiation on the rotation angle of commercial FMs. The FM rotation thermal sensitivity was found to be in a range 0.105 – 0.124°/°C. Gamma-irradiation resulted in a 1.2° change, saturated after a 12.5 kGy dose. Based on these results we conclude that the cubical area is the preferable location for the FMdespite that implies placing additional link fibers to reach the ITER vacuum Vessel.

AB - Plasma current measurements will play an important role in ITER to provide real-time plasma control and machine protection. Performance of standard electromagnetic sensors may be not sufficient to fulfill this task due to a combined effect of steady-state operation and the presence of strong nuclear radiation. The Fiber Optics Current Sensor (FOCS) is a back-up system included in the ITER design. Faraday mirror (FM) can be a part of the FOCS, which allows to improve the system performance. It is required that the polarization rotation angle is equal to 90° with acceptable deviations below 0.3°. We have experimentally investigated the effect of thermal perturbations and gamma-radiation on the rotation angle of commercial FMs. The FM rotation thermal sensitivity was found to be in a range 0.105 – 0.124°/°C. Gamma-irradiation resulted in a 1.2° change, saturated after a 12.5 kGy dose. Based on these results we conclude that the cubical area is the preferable location for the FMdespite that implies placing additional link fibers to reach the ITER vacuum Vessel.

KW - ITER

KW - Radiation effects

KW - Magnetic diagnostics

KW - Plasma current measurements

KW - Fiber optics current sensor

KW - Faraday mirror

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/overview/37605673

U2 - 10.1016/j.fusengdes.2019.01.086

DO - 10.1016/j.fusengdes.2019.01.086

M3 - Special issue

VL - 146

SP - 805

EP - 808

JO - Fusion Engineering & Design

JF - Fusion Engineering & Design

SN - 0920-3796

IS - A

ER -

ID: 6743293