Home > Publications database > Influence of non-local thermodynamic equilibrium and Zeeman effects on magnetic equilibrium reconstruction using spectral motional Stark effect diagnostic > print

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100 1 _ |a Reimer, R.
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245 _ _ |a Influence of non-local thermodynamic equilibrium and Zeeman effects on magnetic equilibrium reconstruction using spectral motional Stark effect diagnostic
260 _ _ |a [S.l.]
|c 2017
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520 _ _ |a The Motional Stark Effect (MSE) diagnostic is a well established technique to infer the local internal magnetic field in fusion plasmas. In this paper, the existing forward model which describes the MSE data is extended by the Zeeman effect, fine-structure, and relativistic corrections in the interpretation of the MSE spectra for different experimental conditions at the tokamak ASDEX Upgrade. The contribution of the non-Local Thermodynamic Equilibrium (non-LTE) populations among the magnetic sub-levels and the Zeeman effect on the derived plasma parameters is different. The obtained pitch angle is changed by 3°…4° and by 0.5°…1° including the non-LTE and the Zeeman effects into the standard statistical MSE model. The total correction is about 4°. Moreover, the variation of the magnetic field strength is significantly changed by 2.2% due to the Zeeman effect only. While the data on the derived pitch angle still could not be tested against the other diagnostics, the results from an equilibrium reconstruction solver confirm the obtained values for magnetic field strength.
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700 1 _ |a Marchuk, O.
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700 1 _ |a Geiger, B.
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700 1 _ |a Mc Carthy, P. J.
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700 1 _ |a Dunne, M.
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700 1 _ |a Hobirk, J.
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700 1 _ |a Wolf, R.
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773 _ _ |a 10.1063/1.4994889
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856 4 _ |y Published on 2017-08-09. Available in OpenAccess from 2018-08-09.
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856 4 _ |y Published on 2017-08-09. Available in OpenAccess from 2018-08-09.
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