Polarization-sensitive reflectometry-based plasma current measurement in ITER: influence of operating temperature

Prasadaraju Dandu, Andrei Goussarov, Marc Wuilpart

Research outputpeer-review


ITER is a tokamak-based fusion device where the knowledge of plasma current is crucial for its safe and successful operation. A polarimetric optical fibre sensor, installed around a section of the ITER Vacuum Vessel (VV), can provide a measure of the plasma current, by exploiting the Faraday effect-induced state of polarization (SOP) rotation of the light launched into the sensing fibre. In the system discussed here, spun fibre is used as the sensing fibre and a polarization-sensitive reflectometer (PSR) is used as the interrogator. In this paper, we analyse the impact of the ITER VV wall ambient temperature on the sensor’s plasma current measurement accuracy, when the other inevitable perturbation effects, namely fibre bending, and twisting are also considered. As ITER is not yet operational and there is no practical way of imitating the ITER operating conditions, we resort to the Jones formalism-based simulation approach to estimate the minimum required L SP B ratio of the spun sensing fibre that satisfies the ITER plasma current measurement specifications, under the considered perturbation effects.

Original languageEnglish
Title of host publicationEuropean Workshop on Optical Fibre Sensors (EWOFS 2023)
EditorsMarc Wuilpart, Christophe Caucheteur
PublisherSPIE - Society of Photo-optical Instrumentation Engineers
Number of pages4
ISBN (Electronic)9781510665002
StatePublished - May 2023
Event2023 - EWOFS: European workshop on optical fibre sensors - Wallonia Conference Centre Mons (WCCM), Mons
Duration: 23 May 202326 May 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference2023 - EWOFS
Internet address

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Computer Science Applications

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