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

0578977 - FZÚ 2024 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Krupka, M. - Kálal, M. - Dostál, Jan - Dudžák, Roman - Juha, Libor
Iterative algorithm for interferometric retrieval of plasma density in case of considerably inhomogeneous objects.
Journal of Physics Conference Series. Bristol: IOP Publishing, 2019, č. článku 012002. ISSN 1742-6588. E-ISSN 1742-6596.
[14th Kudowa Summer School on Towards Fusion Energy. Kudowa Zdroj (PL), 04.06.2018-08.06.2018]
Institucionální podpora: RVO:68378271
Klíčová slova: diagnostic method of plasmas * special iterative algorithm proposed
Obor OECD: Fluids and plasma physics (including surface physics)

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.
Trvalý link: https://hdl.handle.net/11104/0347866