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Energy levels, radiative transition wavelengths and probabilities have beenstudied for the W$^{26+}$ ion using multiconfiguration Dirac-Fock andDirac-Fock-Slater methods. Corona and collisional-radiative models have beenapplied to determine lines and corresponding configurations in a low-densityelectron beam ion trap (EBIT) plasma. Correlation effects for the $4f^{2}$,$4d^{9}4f^{3}$, $4f5l$ ($l=0,...,4$), $4fng$ ($n=5, 6, 7$) configurations havebeen estimated by presenting configuration interaction strengths. It wasdetermined that correlation effects are important for the $4f5s \rightarrow4f^{2}$ transitions corresponding to weak electric octupole transitions in asingle-configuration approach. Correlation effects influence the $4f5d\rightarrow 4f^{2}$ transitions by increasing transition probabilities by anorder of magnitude. Identification of some lines observed in fusion plasma hasbeen proposed. Spectra modeling shows strong increase of lines originating fromthe $4f5s \rightarrow 4f^{2}$ transitions. Other transitions from the $10-30$nm region can be of interest for the EBIT plasma.

Theoretical investigation of spectroscopic properties of W$^{26+}$ in EBIT plasma