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With construction of ITER progressing and existing tokamaks carrying outITER-relevant experiments, accurate fundamental and derived atomic data fornumerous ionization stages of tungsten (W) is required to assess the potentialeffect of this species upon fusion plasmas. The results of fully relativistic,partially radiation damped, Dirac $R$-matrix electron-impact excitationcalculations for the W$^{44+}$ ion are presented. These calculations use aconfiguration interaction and close-coupling expansion that opens-up the3d-subshell, which does not appear to have been considered before in acollision calculation. As a result, it is possible to investigate the arrays,[3d$^{10}$4s$^2-$3d$^9$4s$^2$4f] and [3d$^{10}$4s$^2-$3d$^9$4s4p4d], which arepredicted to contain transitions of diagnostic importance for the soft x-rayregion. Our $R$-matrix collision data are compared with previous $R$-matrixresults by Ballance and Griffin as well as our own relativistically corrected,Breit-Pauli distorted wave and plane-wave Born calculations. All relevant dataare applied to the collisional-radiative modelling of atomic populations, forfurther comparison. This reveals the paramount nature of the 3d-subshelltransitions from the perspectives of radiated power loss and detailedspectroscopy.

Dirac $R$-matrix and Breit-Pauli distorted wave calculations of the electron-impact excitation of W$^{44+}$