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Reimer R, Marchuk O, Geiger B, Mc Carthy PJ, Dunne M, Hobirk J, Wolf R. Influence of non-local thermodynamic equilibrium and Zeeman effects on magnetic equilibrium reconstruction using spectral motional Stark effect diagnostic. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:083509. [PMID: 28863658 DOI: 10.1063/1.4994889] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
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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Affiliation(s)
- R Reimer
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Wendelsteinstraße 1, 17491 Greifswald, Germany
| | - O Marchuk
- Institut für Energie und Klimaforschung-Plasmaphysik, Forschungszentrum Juelich GmbH, 52425 Jülich, Germany
| | - B Geiger
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstraße 2, 85748 Garching, Germany
| | - P J Mc Carthy
- Department of Physics, University College Cork, Association EURATOM-DCU, Cork, Ireland
| | - M Dunne
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstraße 2, 85748 Garching, Germany
| | - J Hobirk
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstraße 2, 85748 Garching, Germany
| | - R Wolf
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Wendelsteinstraße 1, 17491 Greifswald, Germany
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Coelho R, Äkäslompolo S, Dinklage A, Kus A, Reimer R, Sundén E, Conroy S, Blanco E, Conway G, Hacquin S, Heuraux S, Lechte C, Silva FD, Sirinelli A, ITM-TF C. Synthetic Diagnostics in the European Union Integrated Tokamak Modelling Simulation Platform. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst12-473] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R. Coelho
- Associação EURATOM0IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico Universidade Técnica de Lisboa, P-1049-001 Lisboa, Portugal
| | - S. Äkäslompolo
- Aalto University, Euratom-Tekes Association, P.O. Box 14100, FI-00076 AALTO, Finland
| | - A. Dinklage
- Max-Planck-Institut für Plasma physik, EURATOM-Association, Wendelsteinstr. 1, Greifswald, Germany
| | - A. Kus
- Max-Planck-Institut für Plasma physik, EURATOM-Association, Wendelsteinstr. 1, Greifswald, Germany
| | - R. Reimer
- Max-Planck-Institut für Plasma physik, EURATOM-Association, Wendelsteinstr. 1, Greifswald, Germany
| | - E. Sundén
- Uppsala University, VR-Euratom Association, Box 516, 751 20 Uppsala, Sweden
| | - S. Conroy
- Uppsala University, VR-Euratom Association, Box 516, 751 20 Uppsala, Sweden
| | - E. Blanco
- Asociación EURATOM-CIEMAT para Fusión, CIEMAT, Madrid, Spain Association
| | - G. Conway
- Max-Planck-Institut für Plasma physik, EURATOM-IPP Association, Garching, Germany
| | - S. Hacquin
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - S. Heuraux
- Université de Lorraine, IJL, UMR 7198, BP 70239, Vandoeuvre, F-54506 Cedex, France
| | - C. Lechte
- Institute for Plasma Research, University of Stuttgart, 70569 Stuttgart, Germany
| | - F. Da Silva
- Associação EURATOM0IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico Universidade Técnica de Lisboa, P-1049-001 Lisboa, Portugal
| | - A. Sirinelli
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
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Reimer R, Dinklage A, Fischer R, Hobirk J, Löbhard T, Mlynek A, Reich M, Sawyer L, Wolf R. Spectrally resolved motional Stark effect measurements on ASDEX Upgrade. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:113503. [PMID: 24295436 DOI: 10.1063/1.4829665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A spectrally resolved Motional Stark Effect (MSE) diagnostic has been installed at ASDEX Upgrade. The MSE data have been fitted by a forward model providing access to information about the magnetic field in the plasma interior [R. Reimer, A. Dinklage, J. Geiger et al., Contrib. Plasma Phys. 50, 731-735 (2010)]. The forward model for the beam emission spectra comprises also the fast ion Dα signal [W. W. Heidbrink and G. J. Sadler, Nucl. Fusion 34, 535-615 (1994)] and the smearing on the CCD-chip. The calculated magnetic field data as well as the revealed (dia)magnetic effects are consistent with the results from equilibrium reconstruction solver. Measurements of the direction of the magnetic field are affected by unknown and varying polarization effects in the observation.
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Affiliation(s)
- R Reimer
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Wendelsteinstraße 1, 17491 Greifswald, Germany
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