Iterative algorithm for interferometric retrieval of plasma density in case of considerably inhomogeneous objects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F19%3A00333864" target="_blank" >RIV/68407700:21340/19:00333864 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1742-6596/1197/1/012002" target="_blank" >https://iopscience.iop.org/article/10.1088/1742-6596/1197/1/012002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/1197/1/012002" target="_blank" >10.1088/1742-6596/1197/1/012002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Iterative algorithm for interferometric retrieval of plasma density in case of considerably inhomogeneous objects

Popis výsledku v původním jazyce

Interferometry is a widely used active diagnostic method for measurements of physical properties of plasmas. In case of axial symmetry of probed objects an Abel inversion can be used to retrieve plasma density profiles from phase shifts reconstructed from interferograms. This approach is based on the assumption of the diagnostic beam propagating along a straight line. However, it is well known that in case of inhomogeneous media the refraction process affects the diagnostic beam trajectory resulting in an inaccuracy of the retrieved density structure. In order to deal with this unfavourable effect a more sophisticated approach needs to be employed. In this paper a special iterative algorithm is proposed to deal with this issue. This algorithm turns the inversion procedure into series of iterations, where the appropriate distribution of plasma density is found by following the diagnostic beam actual trajectory during its propagation through the inhomogeneous medium. The assumption of axially symmetric plasma distribution still applies. The respective trajectories are calculated using the ray tracing method. This method also allows to use the paraxial wave equation. This iterative algorithm was tested on simulated data with different configurations of plasma density proving its functionality. Results from the simulated data analysis show that using this approach the effect of refraction can be fully compensated and plasma density is thus recovered accurately. Comparison with the results obtained only by the Abel inversion as such is provided for illustration.

Název v anglickém jazyce

Iterative algorithm for interferometric retrieval of plasma density in case of considerably inhomogeneous objects

Popis výsledku anglicky

Interferometry is a widely used active diagnostic method for measurements of physical properties of plasmas. In case of axial symmetry of probed objects an Abel inversion can be used to retrieve plasma density profiles from phase shifts reconstructed from interferograms. This approach is based on the assumption of the diagnostic beam propagating along a straight line. However, it is well known that in case of inhomogeneous media the refraction process affects the diagnostic beam trajectory resulting in an inaccuracy of the retrieved density structure. In order to deal with this unfavourable effect a more sophisticated approach needs to be employed. In this paper a special iterative algorithm is proposed to deal with this issue. This algorithm turns the inversion procedure into series of iterations, where the appropriate distribution of plasma density is found by following the diagnostic beam actual trajectory during its propagation through the inhomogeneous medium. The assumption of axially symmetric plasma distribution still applies. The respective trajectories are calculated using the ray tracing method. This method also allows to use the paraxial wave equation. This iterative algorithm was tested on simulated data with different configurations of plasma density proving its functionality. Results from the simulated data analysis show that using this approach the effect of refraction can be fully compensated and plasma density is thus recovered accurately. Comparison with the results obtained only by the Abel inversion as such is provided for illustration.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA19-24619S" target="_blank" >GA19-24619S: Studium elektronových hustot a spontánních magnetických polí s využitím vícekanálové komplexní interferometrie</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Journal of Physics: Conference Series

ISBN

—

ISSN

1742-6596

e-ISSN

1742-6596

Počet stran výsledku

5

Strana od-do

—

Název nakladatele

IOPscience

Místo vydání

Madeira

Místo konání akce

Kudova-Zdrój

Datum konání akce

4. 6. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000470810400002