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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.

., Weber, B. V., Phipps, D. G., Schumer, J. W., Seely, J. F., Carroll, J. J., VanHoy, J. R., Słabkowska, K., & Polasik, M. (2012). Near-coincident K-line and K-edge energies as ionization diagnostics for some high atomic number plasmas. Phys. Plasmas, 19, 102705. DOI: 10.1063/1.4759497. 6. Seely, J. F., Weber, B. V., Phipps, D. G., Pereira, N. R., Mosher, D., Słabkowska, K., Polasik, M., Starosta, J., Rzadkiewicz, J., Hansen, S., Feldman, U., Hudson, L. T., & Schumer, J. W. (2013). Tungsten L transition line shapes and energy shifts resulting from ionization in warm