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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.

The Review of Scientific Instruments

|July 25, 2024

Summary

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.