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The prototype imaging motional Stark effect diagnostic for ASDEX upgrade.

O P Ford¹, J Howard², R C Wolf¹

¹Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany.

The Review of Scientific Instruments

|October 3, 2015

Summary

This study details the Imaging Motional Stark-Effect (IMSE) diagnostic for ASDEX Upgrade, achieving high accuracy in measuring plasma properties. The developed system corrects for component imperfections, ensuring reliable data even with complex spectra.

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Area of Science:

Plasma physics
Fusion energy research
Diagnostic instrumentation

Background:

The Motional Stark-Effect (MSE) diagnostic is crucial for measuring magnetic fields in fusion plasmas.
Existing MSE diagnostics face challenges with complex spectra and component non-idealities.
Accurate magnetic field measurements are vital for understanding and controlling fusion plasmas.

Purpose of the Study:

To develop and test a prototype Imaging Motional Stark-Effect (IMSE) diagnostic for the ASDEX Upgrade tokamak.
To establish analytical methods for evaluating complex MSE spectra with high accuracy.
To assess and mitigate systematic errors in IMSE measurements.

Main Methods:

Detailed description of the IMSE diagnostic's core hardware and theory of operation.
Testing with a simulated MSE-polarized spectrum to evaluate modulation modes.
Development of analytical methods for evaluating spectral accuracy.
Investigation of non-ideal component effects, such as intrinsic contrast and ellipticity.

Main Results:

The IMSE diagnostic prototype was successfully developed and tested for ASDEX Upgrade.
Small systematic errors were identified in tested modulation modes due to non-ideal components.
Intrinsic contrast from birefringent plates significantly impacts accuracy; mitigation methods were discussed.
Polarization orientation accuracy within ±0.2° and ellipticity measurement accuracy within ±2.0° were demonstrated.
The system exhibits robustness against background light, temperature variations, and spectral complexities.

Conclusions:

The developed IMSE diagnostic is a viable tool for accurate plasma magnetic field measurements on ASDEX Upgrade.
Careful calibration and correction for component non-idealities are essential for achieving high accuracy.
The IMSE diagnostic offers high precision and robustness, crucial for fusion research.