W63+ and W64+ ionization by protons and photons

S. D. LÓPEZ; J. M. RANDAZZO; R. DELLA PICCA; F. D. COLAVECCHIA

S. C. de Bariloche

Conferencia; 17th International Conference Physics of Highly Charged Ions; 2014

Tungsten (W) is presently one of the favorite metals for use as wall material in the International Thermonuclear Experimental Reactor, ITER. For this reason, the properties of tungsten, as a wall material and as an impurity are of great interest. Also, data for radiative and collisional atomic processes involving tungsten ions interacting with the plasma still need to be calculated. In this work we investigate the ionisation by proton impact, recombination and the inverse process photoionzation, involving highly charged ions of W, in particular the Ne-like W$^{64+}$ and Na-like W$^{63+}$ which are predicted to appear with more likely in ITER plasma [1]. Doubly differential and total cross sections are calculated in the continuum-distorted-wave-eikonal-initial-state (CDW-EIS) approximation [2,3] for ion-impact. The initial bounded and final electronic wave functions are obtained with the Optimized Potential Model (OPM) presented by Talman [4]. As an example, in the figure we present DDCS in the forward direction, where the electron capture to the continuum (ECC) peak stands out over a smoothly varying intensity of W$^{63+}$ ionisation from the soft peak ($Eapprox0$) to the binary peak at $Eapprox760$ eV. [1] T. P"utterich {it et al.}, Plasma Phys. Control. Fusion {f 50}, 085016 (2008) [2] D. S. F. Crothers and J. F. McCann, J. Phys. B. {f 16}, 3229 (1983) [3] L. Gulyas, P. D. Fainstein and A. Salin, J. Phys. B. {f 28}, 245 (1995) [4] J. D. Talman, Comp. Phys. Comm. {f 54}, 85 (1989)