Status and future developments of R&D on fiber optics current sensor

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Status and future developments of R&D on fiber optics current sensor. / Goussarov, Andrei; Leysen, Willem; Van Dyck, Steven (Peer reviewer); Wuilpart, Marc; Mégret, Patrice.

In: Fusion Engineering & Design, Vol. 136, 136, 01.03.2018, p. 477-480.

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Goussarov, Andrei ; Leysen, Willem ; Van Dyck, Steven ; Wuilpart, Marc ; Mégret, Patrice. / Status and future developments of R&D on fiber optics current sensor. In: Fusion Engineering & Design. 2018 ; Vol. 136. pp. 477-480.

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@article{427ae855bc7b4c1daf66b00811480018,
title = "Status and future developments of R&D on fiber optics current sensor",
abstract = "Successful operation of ITER will rely on the use of a large set of magnetic diagnostics. Fundamental parameters such as plasma position, shape, and current are required for real-time plasma control and machine protection. For operating tokamaks such measurements are successfully performed using inductive sensors. In ITER and later in DEMO, the presence of strong radiations combined with steady-state operation creates a difficult problem: the useful signal is affected by the integration of radiation-induced noise. An attractive alternative for plasma current measurement consists in using Fiber Optic Current Sensor (FOCS). However, combined effects of radiation, elevated temperatures, vibrations together with the requirement of vacuum compatibility and installation constrains present a significant challenge for the ITER FOCS system. This paper describes recent results of the ITER FOCS R&D intended to demonstrate that the system can be installed on the tokamak and its performance can satisfy the required criteria. We emphasize that the choice of appropriate fibers is critical. Our simulations show that the spun fibers allow satisfying the target performance provided that the fiber beat length over spun period ratio is above a given value. This conclusion is confirmed by the experimental results obtained on JET.",
keywords = "ITER diagnostics, Plasma current measurements, Fiber-optic current sensor (FOCS), JET",
author = "Andrei Goussarov and Willem Leysen and {Van Dyck}, Steven and Marc Wuilpart and Patrice M{\'e}gret",
note = "Score=10",
year = "2018",
month = "3",
day = "1",
doi = "10.1016/j.fusengdes.2018.03.001",
language = "English",
volume = "136",
pages = "477--480",
journal = "Fusion Engineering & Design",
issn = "0920-3796",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Status and future developments of R&D on fiber optics current sensor

AU - Goussarov, Andrei

AU - Leysen, Willem

AU - Wuilpart, Marc

AU - Mégret, Patrice

A2 - Van Dyck, Steven

N1 - Score=10

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Successful operation of ITER will rely on the use of a large set of magnetic diagnostics. Fundamental parameters such as plasma position, shape, and current are required for real-time plasma control and machine protection. For operating tokamaks such measurements are successfully performed using inductive sensors. In ITER and later in DEMO, the presence of strong radiations combined with steady-state operation creates a difficult problem: the useful signal is affected by the integration of radiation-induced noise. An attractive alternative for plasma current measurement consists in using Fiber Optic Current Sensor (FOCS). However, combined effects of radiation, elevated temperatures, vibrations together with the requirement of vacuum compatibility and installation constrains present a significant challenge for the ITER FOCS system. This paper describes recent results of the ITER FOCS R&D intended to demonstrate that the system can be installed on the tokamak and its performance can satisfy the required criteria. We emphasize that the choice of appropriate fibers is critical. Our simulations show that the spun fibers allow satisfying the target performance provided that the fiber beat length over spun period ratio is above a given value. This conclusion is confirmed by the experimental results obtained on JET.

AB - Successful operation of ITER will rely on the use of a large set of magnetic diagnostics. Fundamental parameters such as plasma position, shape, and current are required for real-time plasma control and machine protection. For operating tokamaks such measurements are successfully performed using inductive sensors. In ITER and later in DEMO, the presence of strong radiations combined with steady-state operation creates a difficult problem: the useful signal is affected by the integration of radiation-induced noise. An attractive alternative for plasma current measurement consists in using Fiber Optic Current Sensor (FOCS). However, combined effects of radiation, elevated temperatures, vibrations together with the requirement of vacuum compatibility and installation constrains present a significant challenge for the ITER FOCS system. This paper describes recent results of the ITER FOCS R&D intended to demonstrate that the system can be installed on the tokamak and its performance can satisfy the required criteria. We emphasize that the choice of appropriate fibers is critical. Our simulations show that the spun fibers allow satisfying the target performance provided that the fiber beat length over spun period ratio is above a given value. This conclusion is confirmed by the experimental results obtained on JET.

KW - ITER diagnostics

KW - Plasma current measurements

KW - Fiber-optic current sensor (FOCS)

KW - JET

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/31402787

U2 - 10.1016/j.fusengdes.2018.03.001

DO - 10.1016/j.fusengdes.2018.03.001

M3 - Special issue

VL - 136

SP - 477

EP - 480

JO - Fusion Engineering & Design

JF - Fusion Engineering & Design

SN - 0920-3796

M1 - 136

ER -

ID: 4681986