Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

1.5K
A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
1.5K
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

3.4K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.4K
Joule-Thomson Effect01:21

Joule-Thomson Effect

4.0K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
4.0K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

410
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
410
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

326
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
326

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Assessment of Neutron Radiation Effects on the Fiber Optics Current Sensor Performance During JET DTE2 Experimental Campaign.

Sensors (Basel, Switzerland)·2025
Same author

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

Sensors (Basel, Switzerland)·2023
Same author

Neutronics Simulations for DEMO Diagnostics.

Sensors (Basel, Switzerland)·2023
Same author

First-Principles Density Limit Scaling in Tokamaks Based on Edge Turbulent Transport and Implications for ITER.

Physical review letters·2022
Same author

Demonstration of Safe Termination of Megaampere Relativistic Electron Beams in Tokamaks.

Physical review letters·2021
Same author

Image-Based Methods to Investigate Synchronization between Time Series Relevant for Plasma Fusion Diagnostics.

Entropy (Basel, Switzerland)·2020

Related Experiment Video

Updated: Jul 7, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Performance Enhancement of the Polarimetric Fibre Optical Current Sensor at JET Using Polarisation Optimisation.

Andrei Gusarov1, Perry Beaumont2, Paula Siren2

  • 1SCK CEN Belgian Nuclear Research Centre, 2400 Mol, Belgium.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
Summary

A new method systematically adjusts laser polarization for fiber optic current sensors (FOCS) in tokamaks. This ensures optimal operation by finding the ideal input polarization state for the sensing fiber.

Keywords:
fibre optics current sensor (FOCS)joint European torus (JET)plasma currentpolarimetrypolarisation adjustmenttokamak

More Related Videos

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Related Experiment Videos

Last Updated: Jul 7, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

  • Plasma diagnostics
  • Optical sensing technologies
  • Fusion energy research

Background:

  • Polarimetry-based Fiber Optic Current Sensors (FOCS) require specific linear input polarization for optimal performance.
  • Long fiber optic links in tokamak environments like JET unpredictably alter light polarization, complicating source polarization setting.

Purpose of the Study:

  • To develop and validate a systematic method for determining the optimal laser source polarization state for FOCS deployed in tokamaks.
  • To ensure reliable and accurate FOCS operation by addressing polarization drift in long optical fibers.

Main Methods:

  • A novel method based on FOCS analysis is proposed.
  • The technique involves acquiring data at two distinct input polarization states.
  • Analysis of these measurements allows for the determination of the optimal laser source polarization.

Main Results:

  • The proposed method was experimentally verified in a laboratory setting.
  • The technique was successfully demonstrated on a FOCS installed at the Joint European Torus (JET).
  • The findings confirm the method's effectiveness in achieving optimal FOCS operation.

Conclusions:

  • A systematic approach to optimize laser polarization for tokamak-based FOCS has been established.
  • This method overcomes challenges posed by polarization modifications in long fiber optic links.
  • The successful demonstration at JET validates its practical applicability in fusion research.