Dielectronic Recombination of Br-Like Tungsten Ions

Li, Maijuan; Fu, Yuwei; Su, Maogen; Dong, Chenzhong; Koike, Fumihiro

doi:10.1088/1009-0630/16/3/02

Cited by 13 publications

(11 citation statements)

References 33 publications

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“…Figure 25. Total DR rate coefficients of 35-like tungsten as calculated in this work (black solid), Li et al[33] (red dot), and Wu et al[36] (blue dash).…”

mentioning

confidence: 75%

Partial and total dielectronic recombination rate coefficients forW73+toW56+

2016

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Dielectronic recombination (DR) is the dominant mode of recombination in magnetically confined fusion plasmas for intermediate to lowcharged ions of W. Complete, final-state resolved partial isonuclear W DR rate coefficient data is required for detailed collisional-radiative modelling for such plasmas in preparation for the upcoming fusion experiment ITER. To realize this requirement, we continue The Tungsten Project by presenting our calculations for tungsten ions W 55+ to W 38+ . As per our prior calculations for W 73+ to W 56+ , we use the collision package autostructure to calculate partial and total DR rate coefficients for all relevant core-excitations in intermediate coupling (IC) and configuration average (CA) using κ-averaged relativistic wavefunctions. Radiative recombination (RR) rate coefficients are also calculated for the purpose of evaluating ionization fractions. Comparison of our DR rate coefficients for W 46+ with other authors yields agreement to within 7-19% at peak abundance verifying the reliability of our method. Comparison of partial DR rate coefficients calculated in IC and CA yield differences of a factor ∼ 2 at peak abundance temperature, highlighting the importance of relativistic configuration mixing. Large differences are observed between ionization fractions calculated using our recombination rate coefficient data and that of Pütterich et al [Plasma Phys. and Control. Fusion 50 085016, (2008)]. These differences are attributed to deficiencies in the average-atom method used by the former to calculate their data.

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“…Figure 25. Total DR rate coefficients of 35-like tungsten as calculated in this work (black solid), Li et al[33] (red dot), and Wu et al[36] (blue dash).…”

mentioning

confidence: 75%

Partial and total dielectronic recombination rate coefficients forW73+toW56+

2016

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“…Dielectronic recombination data are being produced in large-scale calculations using existing atomic physics program packages. With emphasis on theory, the published work on dielectronic recombination of tungsten ions has been compiled recently by Li et al [72]. Theoretical studies on dielectronic recombination covering ions with low numbers of electrons can employ well tested theoretical approaches [73][74][75].…”

Section: Electron-ion Recombinationmentioning

confidence: 99%

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Müller

2015

Atoms

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Collisional processes and details of atomic structure of heavy many-electron atoms and ions are not yet understood in a fully satisfying manner. Experimental studies are required for guiding new theoretical approaches. In response to fusion-related needs for collisional and spectroscopic data on tungsten atoms in all charge states, a project has been initiated in which electron-impact and photon-induced ionization as well as photorecombination of W q+ ions are studied. Cross sections and rate coefficients were determined for charge states q ranging from q = 1 to q = 5 for photoionization, for q = 1 up to q = 19 for electron-impact ionization and for q = 18 to q = 21 for electron-ion recombination. An overview, together with a critical assessment of the methods and results is provided.

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“…Moreover, DR has been known as one of the important recombination processes, which plays dominant roles in the ionization equilibrium of various plasmas. Triggered by this, much work on the DR process and the rate coefficients of tungsten ions has been done, both theoretically and experimentally [39][40][41][42][43][44][45][46][47][48][49][50]. For example, the Atomic Data and Analysis Structure (ADAS) database is currently used for modeling plasmas in the community [7,42,51,52].…”

Section: Introductionmentioning

confidence: 99%

Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions

et al. 2015

Atoms

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Electron impact excitation (EIE) and dielectronic recombination (DR) of tungsten ions are basic atomic processes in nuclear fusion plasmas of the International Thermonuclear Experimental Reactor (ITER) tokamak. Detailed investigation of such processes is essential for modeling and diagnosing future fusion experiments performed on the ITER. In the present work, we studied total and partial electron-impact excitation (EIE) and DR cross-sections of highly charged tungsten ions by using the multiconfiguration Dirac-Fock method. The degrees of linear polarization of the subsequent X-ray emissions from unequally-populated magnetic sub-levels of these ions were estimated. It is found that the degrees of linear polarization of the same transition lines, but populated respectively by the EIE and DR processes, are very different, which makes diagnosis of the formation mechanism of X-ray emissions possible. In addition, with the help of the flexible atomic code on the basis of the relativistic configuration interaction method, DR rate coefficients of highly charged W 37+ to W 46+ ions are also studied, because of the importance in the ionization equilibrium of tungsten plasmas under running conditions of the ITER.

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Dielectronic Recombination of Br-Like Tungsten Ions

Cited by 13 publications

References 33 publications

Partial and total dielectronic recombination rate coefficients forW73+toW56+

Partial and total dielectronic recombination rate coefficients forW73+toW56+

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions

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