Radiative recombination data for tungsten ions: III.
Introduction
The present paper completes our calculations for database involving the radiative recombination (RR) and photoionization data for tungsten ions [1], [2], [3], [4], [5]. The database includes total RR cross sections (RRCS), fit parameters for partial photoionization cross sections (PCS), as well as partial and total RR rate coefficients (RR rates) and radiated power loss rate coefficients (RPL rates). Tabulated here are the data for additional ten tungsten ions from W14+ to W23+. Tungsten is assumed to be the plasma-facing material in modern tokamak reactors [6], [7], [8]. Taking into consideration that the RR process and the reverse photoionization process are important mechanisms influencing the equilibria and the thermal balance of fusion plasmas, data on RR and photoionization for tungsten impurity ions are required for modeling and diagnostics of plasmas produced in the reactors.
Section snippets
Method of calculations
Method of calculations and its advantages have been described in detail in papers [1], [2], [9] and in a book chapter [3]. Here we remind that the calculations are based on the fully relativistic treatment of photoionization and RR. All significant multipoles of the radiative field are taken into account. We use the average-configuration Dirac–Fock method with the exact consideration of the electron exchange for calculations of the bound and continuum electron wave functions. Values of RR
Results and discussion
Fig. 1, Fig. 2, Fig. 3 demonstrate total RRCS, RR rates, and RPL rates, respectively, for four representative tungsten ions in the charge range . As is seen, curves and for ions with have noticeable bends in the range ∼100–300 eV. This tendency brings into existence minima and maxima in the-dependence of and for the further low-charged tungsten ions (see [1], data of Table 1 for ). As is evident from Fig. 3, the behavior of total RPL rates is
Conclusions
New accurate data on RR and photoionization are presented for ten tungsten impurity ions in the range W23+. The calculations complete the cycle of the RR and photoionization data for tungsten ions. Our database includes in aggregate RRCS, PCS, and RR/RPL rates for 61 tungsten ions from W14+ to the bare nucleus as well as RRCS and PCS for the ion . The data are necessary for diagnostics and modeling fusion plasmas investigated in such devices as ITER, ASDEX Upgrade, and EBIT.
In all our
Acknowledgment
This work was funded through the International Atomic Energy Agency under Contract No. 16357/RBF which is gratefully acknowledged.
References (15)
- et al.
At. Data Nucl. Data Tables
(2008) - et al.
At. Data Nucl. Data Tables
(2010) - et al.
At. Data Nucl. Data Tables
(2013) - et al.
At. Data Nucl. Data Tables
(2014) - et al.
At. Data Nucl. Data Tables
(2009) - et al.
At. Data Nucl. Data Tables
(2000) - et al.
At. Data Nucl. Data Tables
(1993)