Two-point motional Stark effect diagnostic for Madison Symmetric Torus

J. Ko; D. J. Den Hartog; K. J. Caspary; E. A. Den Hartog; N. A. Pablant; H. P. Summers

doi:10.1063/1.3461995

Two-point motional Stark effect diagnostic for Madison Symmetric Torus

J. Ko, D. J. Den Hartog, K. J. Caspary, E. A. Den Hartog, N. A. Pablant, H. P. Summers

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Abstract

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.

Original language	English
Pages (from-to)	1-3
Number of pages	3
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3461995
Publication status	Published - Oct 2010

Keywords

beam emission-spectroscopy
reversed-field pinch

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title = "Two-point motional Stark effect diagnostic for Madison Symmetric Torus",

abstract = "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.",

keywords = "beam emission-spectroscopy, reversed-field pinch",

author = "J. Ko and {Den Hartog}, {D. J.} and Caspary, {K. J.} and {Den Hartog}, {E. A.} and Pablant, {N. A.} and Summers, {H. P.}",

year = "2010",

month = oct,

doi = "10.1063/1.3461995",

language = "English",

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T1 - Two-point motional Stark effect diagnostic for Madison Symmetric Torus

AU - Ko, J.

AU - Den Hartog, D. J.

AU - Caspary, K. J.

AU - Den Hartog, E. A.

AU - Pablant, N. A.

AU - Summers, H. P.

PY - 2010/10

Y1 - 2010/10

N2 - 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.

AB - 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.

KW - beam emission-spectroscopy

KW - reversed-field pinch

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U2 - 10.1063/1.3461995

DO - 10.1063/1.3461995

M3 - Article

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VL - 81

SP - 1

EP - 3

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

ER -

Two-point motional Stark effect diagnostic for Madison Symmetric Torus

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