Excited-state populations of hydrogenlike and heliumlike ions and diagnostics of dense transient plasmas from the relative intensities of spectral lines

Experimental and theoretical evaluation of the HeII6560.1 Å line contribution to the deuterium Dα spectral line shape in Tore Supra Ergodic Divertor plasmas

“…It is therefore necessary to use a CR model to predict the population densities of each energy level implied in the considered transitions. Since a simple extrapolation of the hydrogen data is not applicable, it is necessary to calculate the CR equilibrium of the He + hydrogen-like ions [12][13][14].…”

“…Kuz'micheva and Ragozin [14] tabulated the data necessary for CR calculations of hydrogen-like ions, with scaling laws for Z and the initial and final level n values, for a large range of electron density and temperature values, including both electron excitation and recombination to a given level. These data are presented as tables, giving the global coefficients r 0 (n, T e N e ) and r 1 (n, T e , N e ) for the population of an excited level n, as well as the CR ionization and recombination coefficients.…”

“…The calculated PEC's for the He II spectral lines of interest here are presented in figures 6 and 7. Figure 6 shows the He II Pα line PEC's (for both the electron excitation and recombination contributions) from the ADAS database [16] as functions of the electron temperature T e for two electron density values, N e = 10 18 m −3 (full curve) and 10 19 m −3 [12], [13], and [14], respectively, for an electron density N e = 1.28 × 10 18 m −3 . The full and broken curves represent the PEC's calculated using the ADAS database [16], for two electron densities, N e = 10 18 m −3 and 10 19 m −3 , respectively.…”

“…(broken curve); there is practically no N e dependence. For comparison we also included the values calculated from [12][13][14] for an electron density of N e = 1.28 × 10 18 m −3 . Figure 7 shows the electron excitation and recombination PEC's for the He II transitions of interest in the Brackett series, for the same conditions as in figure 6.…”

“…He II Pα line PEC's for electron excitation and recombination. Symbols ×, •, and * represent calculated PEC's from[12],[13], and[14], respectively, for an electron density N e = 1.28 × 10 18 m −3 . The full and broken curves represent the PEC's calculated using the ADAS database[16], for two electron densities, N e = 10 18 m −3 and 10 19 m −3 , respectively.…”