Modelling of the soft X-ray tungsten spectra expected to be registered by GEM detection system for WEST

Łukasz Syrocki 1 , 2 , Ewa Szymańska 3 , Katarzyna Słabkowska 4 , 5 , Marek Polasik 3 , 4 ,  and Grzegorz Pestka 2
  • 1 Institute of Plasma Physics and Laser Microfusion, 23 Hery Str., 01-497 Warsaw, Poland Poland
  • 2 Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, 87-100 Toruń, Poland
  • 3 Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 87-100 Toruń, Poland
  • 4 Institute of Plasma Physics and Laser Microfusion, 01-497 Warsaw, Poland Poland
  • 5 Faculty of Chemistry, Nicolaus Copernicus University in Toruń,87-100 Toruń, Poland

Abstract

In the future International Thermonuclear Experimental Reactor (ITER), the interaction between the plasma and the tungsten chosen as the plasma-facing wall material imposes that the hot central plasma loses energy by X-ray emission from tungsten ions. On the other hand, the registered X-ray spectra provide alternative diagnostics of the plasma itself. Highly ionized tungsten emits extremely complex X-ray spectra that can be understood only after exhaustive theoretical studies. The detailed analyses will be useful for proper interpretation of soft X-ray plasma radiation expected to be registered on ITER-like machines, that is, Tungsten (W) Environment in Steady-state Tokamak (WEST). The simulations of the soft X-ray spectra structures for tungsten ions have been performed using the flexible atomic code (FAC) package within the framework of collisional-radiative (CR) model approach for electron temperatures and densities relevant to WEST tokamak.

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