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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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The motional Stark effect diagnostic for ITER using a line-shift approach.

E L Foley1, F M Levinton, H Y Yuh

  • 1Nova Photonics, Inc., Princeton, New Jersey 08540, USA. foley@novaphotonics.com

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary

A new motional Stark effect (MSE) method using spectral line shifts (MSE-LS) offers a robust way to measure internal plasma magnetic fields in fusion devices like ITER. This approach is less susceptible to mirror degradation than traditional polarization methods.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Spectroscopy

Background:

  • Motional Stark effect (MSE) systems are crucial for measuring internal plasma magnetic fields in fusion devices.
  • The harsh ITER environment poses challenges for traditional MSE systems due to mirror degradation from plasma interactions.
  • Degradation affects polarization reflection properties, impacting the accuracy of magnetic field measurements.

Purpose of the Study:

  • To present a new MSE-based approach for internal plasma magnetic field measurements on ITER.
  • To evaluate the utility of the proposed MSE spectral line shift (MSE-LS) method for equilibrium reconstruction.
  • To compare the new MSE-LS method with the traditional line polarization approach.

Main Methods:

  • Developed and studied a novel MSE-based approach utilizing spectral line shifts (MSE-LS) to determine magnetic field profiles.
  • Employed the ESC-ERV code system to assess the effectiveness of MSE-LS for plasma equilibrium reconstruction.
  • Simulated MSE-LS performance for both ITER and the National Spherical Torus Experiment (NSTX).

Main Results:

  • The MSE-LS method provides a radial profile of the magnetic field magnitude.
  • Simulation results indicate the viability of MSE-LS for equilibrium reconstruction in ITER.
  • Tests on NSTX using MSE with laser-induced fluorescence demonstrate precision spectroscopy relevant to ITER.

Conclusions:

  • The MSE-LS approach offers a promising alternative to traditional MSE polarimetry for magnetic field measurements in fusion devices.
  • This method is more resilient to surface degradation issues encountered in harsh plasma environments.
  • Further validation through experiments on NSTX will inform the implementation of MSE-LS on ITER.