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Investigation of inversion methods for calculation of soft X-ray-based plasma position and its consistency with magneticall determined position on tokamaks
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SYSNO ASEP 0471067 Document Type A - Abstract R&D Document Type O - Ostatní Title Investigation of inversion methods for calculation of soft X-ray-based plasma position and its consistency with magneticall determined position on tokamaks Author(s) Imríšek, Martin (UFP-V) RID
Mlynář, Jan (UFP-V) RID
Odstrčil, T. (DE)
Odstrčil, M. (GB)
Svoboda, J. (CZ)
Löffelmann, V. (CZ)
Ficker, Ondřej (UFP-V) ORCID
Weinzettl, Vladimír (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDSource Title Bulletin of the American Physical Society, 58th Annual Meeting of the APS Division of Plasma Physics, 18. - San Jose : American Physical Society, 2016 - ISSN 0003-0503
S. 112Number of pages 1 s. Publication form Online - E Action APS 58th Annual Meeting of the APS Division of Plasma Physics /58./ Event date 31.10.2016 - 04.11.2016 VEvent location San Jose, California Country US - United States Event type WRD Language eng - English Country US - United States Keywords plasma position ; tomography ; soft x-ray ; Tikhonov regularization Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects LG14002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 Annotation Distribution of soft X-ray (SXR) radiation in tokamak plasma can be reconstructed via tomography from line integrated measurements. The center of mass of the SXR distribution gives reliable information about plasma position assuming a
primary source being bremsstrahlung. The Tikhonov regularization constrained by the minimum Fisher information is often applied to
solve the ill-posed and underdetermined plasma tomography. There are two ways how to apply this method on large datasets: to use either a rapid version that process all time slices simultaneously or linear inversion methods which provide the center of radiation
as a scalar product of the measured data and precomputed weight vector. Here, robustness, reliability and computational time of various methods of the calculation of the center of SXR emissivity are compared on modeled and real data. Furthermore, consistency of the magnetic and SXR plasma position influenced by the plasma shape and impurities is analyzed and discussed.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
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