Advances in Time-Resolved Measurement of Magnetic Field and Electron Temperature in Low-Magnetic-Field Plasmas

Hartog, D. J. Den; Ambuel, J.R.; Borchardt, M.; Caspary, Kyle; Hartog, E. A. Den; Falkowski, Adam; Harris, W.S.; Ko, Jinseok; Pablant, N.; Reusch, J.A.; Robl, P.; Stephens, H.D.; Summers, H. P.; Yang, Yanan

doi:10.13182/fst11-a11589

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“…2,3 Low-magnetic-field (0.2-0.6 T) MSE spectra are routinely obtained with hightime resolution from reversed field pinch (RFP) plasmas in the Madison symmetric torus (MST), 4 which makes MST a good test bed for investigating the fully spectral MSE approach and the relevant atomic physics. Because the MSE diagnostic at MST deals with Stark spectra generated under such low magnetic fields, in principle the analysis should rely on an atomic model that includes spin-orbit coupling, Zeeman effects, and non-statistical populations of upper states in diagnostic-neutral-beam excitation.…”

Section: Introductionmentioning

confidence: 99%

Improved spectral analysis for the motional Stark effect diagnostic

Klabacha

2012

Review of Scientific Instruments

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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-radiative model with level populations nlm-resolved up to n = 4 and a simple Born approximation for ion-impact cross sections is used for this analysis. Measurement uncertainty is quantified by making MSE measurements with multiple views of a single spatial location, ranging 5%-15% for typical MST operation conditions. A multi-view fit improves the goodness of fit of MSE spectral features and background.

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Section: Introductionmentioning

confidence: 99%