Dielectronic recombination of Zn-like W$^{44+}$ from Cu-like W$^{45+}$

Energy levels, radiative transition probabilities, and autoionization rates for [Ar]$3d^{10}4l'nl$ ($n$=4-12, $l \le n-1$), [Ar]$3d^{10}5l'nl$ ($n$=5-8, $l \le n-1$), and [Ar]$3d^{9}4l'4l''nl$ ($n$=4-5, $l \le n-1$) states in Zn-like tungsten (W$^{44+}$) are calculated using the Hartree-Fock-Relativistic method (COWAN code), the Multiconfiguration relativistic Hebrew University Lawrence Atomic Code (HULLAC code), and the relativistic many-body perturbation theory method (RMBPT code). Autoionizing levels above the thresholds [Ar]$3d^{10}4s$ are considered. It is shown that the contribution of the highly excited states is very important for the calculation of total DR rates. Contributions to DR rate from the excited [Ar]$4l'nl$ states with $n \ge 13$ and [Ar]$4l'nl$ states with $n \ge 8$, and additionally from core-excited [Ar]$3d^94l'4l''nl$ states with $n \ge 5$ are estimated by extrapolation of all atomic parameters. The total DR rate coefficient is derived as a function of electron temperature. Synthetic dielectronic satellite spectra from Zn-like W are simulated in a broad spectral range from 4 to to 140\AA.~ These calculations provide highly accurate values for a number of W$^{44+}$ properties useful for a variety of applications, including fusion and HEDP applications.