Two-point motional Stark effect diagnostic for Madison Symmetric Torus

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3461995· OSTI ID:22055795

Ko, J; Den Hartog, D J; Caspary, K J; Den Hartog, E A ^[1]; Pablant, N A ^[2]; Summers, H P ^[3]

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1. University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
2. University of California-San Diego, La Jolla, California 92093 (United States)
3. University of Strathclyde, Glasgow G1 1XQ, Scotland (United Kingdom)

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 MSE spectra. Systematic errors are reduced by using atomic data from atomic data and analysis structure in the fit. Reconstructed current density and safety factor profiles are more strongly and globally constrained with the addition of the off-axis radius measurement than with the on-axis one only.

• OSTI ID: 22055795
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
CURRENT DENSITY
INCLINATION
MAGNETIC FIELDS
MST DEVICE
PLASMA
SPECTRA
STARK EFFECT