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Implementation of a real-time MSE system.

The Review of scientific instruments·2024
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The motional Stark effect diagnostic for ITER.

The Review of scientific instruments·2024
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The Motional Stark Effect (MSE) diagnostic for ITER uses a spectral approach to measure electric fields, replacing conventional polarimetry. This method analyzes Stark splitting of the Balmer-α line for accurate electric field quantification in fusion devices.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Spectroscopy

Background:

  • ITER requires advanced diagnostics for plasma characterization.
  • Conventional Motional Stark Effect (MSE) polarimetry faces calibration challenges in the ITER environment.
  • A spectral approach using Stark splitting offers a more robust alternative for ITER.

Purpose of the Study:

  • To design and model a novel MSE diagnostic for ITER utilizing the line shift (LS) method.
  • To quantify the Lorentz electric field magnitude by measuring Stark manifold splitting.
  • To address the unique challenges posed by ITER's high magnetic fields and beam energies.

Main Methods:

  • Development of a full system model and numerical simulations for MSE-LS sightlines.
  • Photon noise analysis across various optical transmission fractions to determine statistical uncertainties.
  • Conceptual design of a high-throughput spectrometer incorporating a volume phase transmission grating.

Main Results:

  • Statistical uncertainties were determined through photon noise analysis, guiding spectrometer design parameters.
  • The study provides crucial insights into spectrometer throughput, dispersion, and optical component selection.
  • A conceptual design for a high-throughput spectrometer suitable for the MSE-LS diagnostic was presented.

Conclusions:

  • The MSE-LS spectral approach is a promising diagnostic for ITER, despite stringent error tolerances.
  • The developed system model and simulations are essential for optimizing the diagnostic design.
  • This work provides guidance for critical design choices, ensuring the feasibility of the MSE-LS diagnostic on ITER.