Investigation of inversion methods for calculation of soft X-ray-based plasma position and its consistency with magneticall determined position on tokamaks

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00471067" target="_blank" >RIV/61389021:_____/16:00471067 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Investigation of inversion methods for calculation of soft X-ray-based plasma position and its consistency with magneticall determined position on tokamaks

Popis výsledku v původním jazyce

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 anprimary source being bremsstrahlung. The Tikhonov regularization constrained by the minimum Fisher information is often applied tonsolve 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 radiationnas 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.n

Název v anglickém jazyce

Investigation of inversion methods for calculation of soft X-ray-based plasma position and its consistency with magneticall determined position on tokamaks

Popis výsledku anglicky

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 anprimary source being bremsstrahlung. The Tikhonov regularization constrained by the minimum Fisher information is often applied tonsolve 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 radiationnas 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.n

Druh

O - Ostatní výsledky

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

<a href="/cs/project/LG14002" target="_blank" >LG14002: Přímá vědecká účast v programu termojaderného výzkumu Společného evropského toru JET</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů