Recent achievements in R&D on fibre optics current sensor for ITER

Andrei Goussarov; Willem Leysen; Song Moon Kim; Prasad Dandu; Marc Wuilpart; Alessandro Danisi; Jose Luis Barbero soto; George Vayakis

doi:10.1016/j.fusengdes.2023.113626

Recent achievements in R&D on fibre optics current sensor for ITER

Andrei Goussarov, Willem Leysen, Song Moon Kim, Prasad Dandu, Marc Wuilpart, Alessandro Danisi, Jose Luis Barbero soto, George Vayakis

Research output › peer-review

Abstract

ITER is expected to achieve new milestones on the way to commercial fusion energy production. This will be still a research machine where numerous diagnostic systems are deployed, both already used on existing tokamaks and developed specifically for burning plasma operation. One of the innovative diagnostics is the Fibre Optics Current Sensor (FOCS). This paper describes recent results of the ITER FOCS development, concentrating on the front-end design. The FOCS sensing fibre, likely acrylate coated, will be located directly on the external surface of the vacuum vessel. During operation, it will be exposed to temperatures of 100–110 °C and multi-MGy level total radiation doses, while during vacuum vessel baking intervals the temperature will be 200–210 °C with low levels of radiation. Such temperatures are outside the nominal range for acrylate coatings even for acrylate coatings specially designed for high temperature applications. We provide experimental results that indicate that acrylate coated fibres FOCS fibres nevertheless can survive ITER environment without critical degradation and attribute this to the system design, for which the fibre operates in an inert gas (neon) atmosphere.

Original language	English
Article number	113626
Number of pages	7
Journal	fusion engineering and design
Volume	192
DOIs	https://doi.org/10.1016/j.fusengdes.2023.113626
State	Published - Jul 2023

ASJC Scopus subject areas

Mechanical Engineering
Materials Science(all)
Nuclear Energy and Engineering
Civil and Structural Engineering

Access to Document

10.1016/j.fusengdes.2023.113626

Cite this

@article{10b85320de01428aa214074c35a22cba,

title = "Recent achievements in R&D on fibre optics current sensor for ITER",

abstract = "ITER is expected to achieve new milestones on the way to commercial fusion energy production. This will be still a research machine where numerous diagnostic systems are deployed, both already used on existing tokamaks and developed specifically for burning plasma operation. One of the innovative diagnostics is the Fibre Optics Current Sensor (FOCS). This paper describes recent results of the ITER FOCS development, concentrating on the front-end design. The FOCS sensing fibre, likely acrylate coated, will be located directly on the external surface of the vacuum vessel. During operation, it will be exposed to temperatures of 100–110 °C and multi-MGy level total radiation doses, while during vacuum vessel baking intervals the temperature will be 200–210 °C with low levels of radiation. Such temperatures are outside the nominal range for acrylate coatings even for acrylate coatings specially designed for high temperature applications. We provide experimental results that indicate that acrylate coated fibres FOCS fibres nevertheless can survive ITER environment without critical degradation and attribute this to the system design, for which the fibre operates in an inert gas (neon) atmosphere.",

keywords = "Coatings, Fibers, High temperature applications, Inert gases, Magnetoplasma, Plasma diagnostics, Acrylate coatings, Burning plasmas, Diagnostic systems, Energy productions, Fiber-optic current sensor, Fusion energy, ITER, Plasma's diagnostics, Thermal-annealing, Vacuum vessel, Radiation effects, Fibre optics current sensor, Thermal annealing",

author = "Andrei Goussarov and Willem Leysen and Kim, {Song Moon} and Prasad Dandu and Marc Wuilpart and Alessandro Danisi and {Barbero soto}, {Jose Luis} and George Vayakis",

note = "Score=10 Funding Information: This work has been carried out under support from the Belgian Federal Government , also within the framework of the ITER – SCK CEN collaboration agreement. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization, the Belgian Federal Government, and the SCK CEN. This work was partially supported by the Fonds de la Recherche Scientifique–FNRS under the convention PDR T.0252.19 . Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

month = jul,

doi = "10.1016/j.fusengdes.2023.113626",

language = "English",

volume = "192",

journal = "Fusion Engineering & Design",

issn = "0920-3796",

publisher = "Elsevier",

}

TY - JOUR

T1 - Recent achievements in R&D on fibre optics current sensor for ITER

AU - Goussarov, Andrei

AU - Leysen, Willem

AU - Kim, Song Moon

AU - Dandu, Prasad

AU - Wuilpart, Marc

AU - Danisi, Alessandro

AU - Barbero soto, Jose Luis

AU - Vayakis, George

N1 - Score=10 Funding Information: This work has been carried out under support from the Belgian Federal Government , also within the framework of the ITER – SCK CEN collaboration agreement. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization, the Belgian Federal Government, and the SCK CEN. This work was partially supported by the Fonds de la Recherche Scientifique–FNRS under the convention PDR T.0252.19 . Publisher Copyright: © 2023 Elsevier B.V.

PY - 2023/7

Y1 - 2023/7

N2 - ITER is expected to achieve new milestones on the way to commercial fusion energy production. This will be still a research machine where numerous diagnostic systems are deployed, both already used on existing tokamaks and developed specifically for burning plasma operation. One of the innovative diagnostics is the Fibre Optics Current Sensor (FOCS). This paper describes recent results of the ITER FOCS development, concentrating on the front-end design. The FOCS sensing fibre, likely acrylate coated, will be located directly on the external surface of the vacuum vessel. During operation, it will be exposed to temperatures of 100–110 °C and multi-MGy level total radiation doses, while during vacuum vessel baking intervals the temperature will be 200–210 °C with low levels of radiation. Such temperatures are outside the nominal range for acrylate coatings even for acrylate coatings specially designed for high temperature applications. We provide experimental results that indicate that acrylate coated fibres FOCS fibres nevertheless can survive ITER environment without critical degradation and attribute this to the system design, for which the fibre operates in an inert gas (neon) atmosphere.

AB - ITER is expected to achieve new milestones on the way to commercial fusion energy production. This will be still a research machine where numerous diagnostic systems are deployed, both already used on existing tokamaks and developed specifically for burning plasma operation. One of the innovative diagnostics is the Fibre Optics Current Sensor (FOCS). This paper describes recent results of the ITER FOCS development, concentrating on the front-end design. The FOCS sensing fibre, likely acrylate coated, will be located directly on the external surface of the vacuum vessel. During operation, it will be exposed to temperatures of 100–110 °C and multi-MGy level total radiation doses, while during vacuum vessel baking intervals the temperature will be 200–210 °C with low levels of radiation. Such temperatures are outside the nominal range for acrylate coatings even for acrylate coatings specially designed for high temperature applications. We provide experimental results that indicate that acrylate coated fibres FOCS fibres nevertheless can survive ITER environment without critical degradation and attribute this to the system design, for which the fibre operates in an inert gas (neon) atmosphere.

KW - Coatings

KW - Fibers

KW - High temperature applications

KW - Inert gases

KW - Magnetoplasma

KW - Plasma diagnostics

KW - Acrylate coatings

KW - Burning plasmas

KW - Diagnostic systems

KW - Energy productions

KW - Fiber-optic current sensor

KW - Fusion energy

KW - ITER

KW - Plasma's diagnostics

KW - Thermal-annealing

KW - Vacuum vessel

KW - Radiation effects

KW - Fibre optics current sensor

KW - Thermal annealing

U2 - 10.1016/j.fusengdes.2023.113626

DO - 10.1016/j.fusengdes.2023.113626

M3 - Article

SN - 0920-3796

VL - 192

JO - Fusion Engineering & Design

JF - Fusion Engineering & Design

M1 - 113626

ER -