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Distributed Poloidal Magnetic Field Measurement in Tokamaks Using Polarization-Sensitive Reflectometric Fiber Optic

Prasad Dandu1, Andrei Gusarov2, Willem Leysen2

  • 1Department of Electromagnetism and Telecommunications, University of Mons, 7000 Mons, Belgium.

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Summary
This summary is machine-generated.

This study introduces an optical fiber sensor for measuring poloidal magnetic fields in tokamaks, utilizing Rayleigh backscattering and the Faraday effect. The sensor demonstrates accurate magnetic field measurements, crucial for tokamak operation.

Keywords:
JET magnetic fielddistributed magnetic field measurementoptical fiber sensorpolarization-sensitive reflectometrypoloidal magnetic field measurementtokamak

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Optical sensing technologies

Background:

  • Accurate measurement of the poloidal magnetic field is critical for stable tokamak operation and plasma confinement.
  • Existing magnetic field diagnostic methods often face limitations in spatial resolution or invasiveness.

Purpose of the Study:

  • To propose and validate a novel optical fiber sensor for distributed poloidal magnetic field measurement in tokamaks.
  • To leverage intrinsic optical fiber properties for enhanced magnetic field diagnostics.

Main Methods:

  • Utilizing a polarization-sensitive optical fiber sensor exploiting Rayleigh backscattering for distributed measurements.
  • Employing the Faraday magneto-optic effect, where magnetic field-induced polarization rotation is measured along the fiber.
  • Experimentally validating the sensor on the Joint European Torus (JET) tokamak.

Main Results:

  • The optical fiber sensor successfully measured the spatial distribution of the poloidal magnetic field.
  • Experimental results showed good agreement with measurements from internal discrete coils.
  • A method was proposed and simulated to improve data recovery in noisy regions.

Conclusions:

  • The polarization-sensitive optical fiber sensor is a viable and accurate diagnostic for poloidal magnetic fields in tokamaks.
  • This technology offers a promising non-invasive method for magnetic field monitoring in fusion devices.
  • Further development could enhance data quality and applicability in challenging tokamak environments.