Instrumentation for a multichord motional Stark effect diagnostic in KSTAR

Motional Stark Effect Diagnostics for KSTAR

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Two-point motional Stark effect diagnostic for Madison Symmetric Torus.

A high-precision spectral motional Stark effect (MSE) diagnostic provides internal magnetic field measurements for Madison Symmetric Torus (MST) plasmas. Currently, MST uses two spatial views--on the magnetic axis and on the midminor (off-axis) radius, the latter added recently. A new analysis scheme has been developed to infer both the pitch angle and the magnitude of the magnetic field from M...

Improved spectral analysis for the motional Stark effect diagnostic.

The magnetic pitch angle and the magnitude from reversed field pinch plasmas in the Madison symmetric torus (MST) have been routinely obtained from fully resolved motional Stark effect (MSE) spectrum analyses. Recently, the spectrum fit procedure has been improved by initializing and constraining the fit parameters based on the MSE model in the atomic data and analysis structure. A collisional-...

The MAST motional Stark effect diagnostica)

Snapshot-imaging motional Stark effect polarimetry

Measurement of the motional Stark effect (MSE) for Balmer alpha light emitted from heating or diagnostic neutral beams is a standard technique for estimating plasma toroidal current density in tokamaks. Most techniques typically rely on a determination of the polarization angle or relative intensities of the multiplet components which are spectrally resolved using either an array of interferenc...