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Implementation of a real-time MSE system.

The Review of scientific instruments·2024
Same author

Designing ITER motional Stark effect line shift (MSE-LS) spectrometers.

The Review of scientific instruments·2024
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Related Experiment Video

Updated: Apr 30, 2026

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
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The motional Stark effect diagnostic for ITER.

E L Foley1, F M Levinton1, I U Uzun-Kaymak1

  • 1Nova Photonics, Inc., 211 College Road East, Suite 103, Princeton, New Jersey 08540, USA.

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The motional Stark effect (MSE) diagnostic will measure magnetic fields in ITER plasmas. This system will determine the safety factor profile, crucial for fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Engineering
  • Diagnostic Instrumentation

Background:

  • The International Thermonuclear Experimental Reactor (ITER) requires precise plasma diagnostics.
  • Accurate measurement of the safety factor profile (q(r)) is critical for controlling fusion plasmas.
  • Traditional motional Stark effect (MSE) diagnostics face challenges in ITER's harsh environment.

Purpose of the Study:

  • To present the installation plans for the MSE diagnostic system on ITER.
  • To outline the strategy for achieving high-resolution magnetic field measurements within the plasma.
  • To detail the methods for constraining equilibrium reconstructions and determining the q(r) profile.

Main Methods:

  • Utilizing the motional Stark effect (MSE) diagnostic to observe D/H-α emission from neutral beams.
  • Leveraging the Lorentz electric field (v⃗×B⃗) experienced by beam atoms in the magnetic field.
  • Employing Stark spectrum line shift analysis to determine magnetic field magnitude, overcoming polarization issues from mirror contamination.

Main Results:

  • The MSE diagnostic will provide spatially localized magnetic field measurements.
  • The system aims to meet stringent requirements for q-profile determination: 20 radial points, 10 ms time resolution, and <10% accuracy.
  • The chosen method addresses challenges posed by ITER's burning plasma environment and potential mirror contamination.

Conclusions:

  • The MSE diagnostic is essential for ITER's operational success and plasma control.
  • Careful planning and analysis of the measurement system are required for the ITER environment.
  • The Stark spectrum line shift approach is selected to ensure reliable magnetic field measurements on ITER.