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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...

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The MAST motional Stark effect diagnostic.

N J Conway¹, M F M De Bock, C A Michael

¹EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom. neil.conway@ccfe.ac.uk

The Review of Scientific Instruments

|November 2, 2010

Summary

The MAST spherical tokamak now uses a motional Stark effect (MSE) diagnostic for routine operation. This advanced system provides high-resolution measurements crucial for understanding plasma behavior in fusion research.

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Area of Science:

Plasma Physics
Fusion Energy Research
Diagnostic Techniques

Background:

The Motional Stark Effect (MSE) diagnostic is essential for measuring internal magnetic fields in fusion devices.
Accurate magnetic field measurements are critical for controlling and understanding plasma behavior in tokamaks.
The MAST spherical tokamak required an upgraded MSE system for improved performance.

Purpose of the Study:

To install and routinely operate a new Motional Stark Effect (MSE) diagnostic system on the MAST spherical tokamak.
To achieve high spatial and temporal resolution for magnetic field measurements.
To validate the performance of the MSE diagnostic against atomic physics predictions and alternative configurations.

Main Methods:

Installation of a 35-channel radial MSE diagnostic with ~2.5 cm spatial and ~1 ms temporal resolution.
Utilized narrow interference filters to isolate π or σ polarized emission.
Employed avalanche photodiode detectors with digital phase-sensitive detection to measure polarization states via photoelastic modulators.
Conducted trials with a wide filter admitting the entire Stark pattern.

Main Results:

The π emission component was found to be significantly stronger than σ, aligning with atomic physics calculations.
Most channels were successfully operated using the π component.
Trials with a wide filter demonstrated performance comparable to conventional channels.
MSE-constrained equilibrium reconstructions were achieved between experimental pulses.

Conclusions:

The new MSE diagnostic system is operating routinely and effectively on the MAST spherical tokamak.
The system provides high-quality data crucial for plasma equilibrium reconstruction.
The diagnostic's performance validates its utility for future fusion energy research.