Tungsten Data for Current and Future Uses in Fusion and Plasma Science

Beiersdörfer, P.; Clementson, J.; Safronova, U. I.

doi:10.3390/atoms3020260

Cited by 29 publications

(25 citation statements)

References 84 publications

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“…Motivated by the potential use in plasma diagnostics in the future tokamak fusion reactor ITER, M-shell W 56+ − W 61+ tungsten ions are at present subject of extensive research [1][2][3][4][5][6][7]. Tungsten ions can be transported from the relatively cold divertor region to the plasma core with temperatures on the order of 20 keV, and ionize to M-shell charge states, which are expected to strongly emit in the x-ray and extreme ultraviolet (EUV) spectral ranges.…”

Section: Introductionmentioning

confidence: 99%

“…We compared the performance of three different quantum electrodynamic (QED) potentials [13,14] to estimate the accuracy of QED calculations, and reported improved theoretical excitation energies and transition wavelengths for W 58+ by at least one order of magnitude. The accuracy of the MCDHF-RCI calculations [11] allowed the authors to assign the unidentified line at λ = 34.779(4) Å from [9] to the M1 transition 3s 2 3p 4 1 D 2 → 3s 2 3p 4 3 P 2 of S-like W. The present study is an extension of our recent work on W 58+ [11]. We use two methods, MCDHF-RCI and relativistic many-body perturbation theory (RMBPT), to study systematically the properties of tungsten with higher degree of ionization, up to W 61+ .…”

Section: Introductionmentioning

confidence: 99%

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Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten

et al. 2020

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Atomic properties of S-like W are evaluated through a state-of-the-art method, namely, the multiconfiguration Dirac-Hartree-Fock (MCDHF) method combined with the relativistic configuration interaction (RCI) approach. The level energies, wavelengths, and transition parameters involving the 88 lowest levels of W +58 (W LIX) are calculated. We discuss in detail the relative importance of the valence-and core-valence electron correlation effects, the Breit interaction, the higher order retardation correction beyond the Breit interaction through the transverse photon interaction, and the quantum electrodynamical (QED) corrections. The present level energies are highly accurate, with uncertainties close to what can be achieved from spectroscopy. As such, they provide benchmark tests for other theoretical calculations of S-like W and should assist the spectroscopists in their assignment/identification of observed lines in complex spectra.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten

et al. 2020

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“…It has been designed to focus on the Xray emission of neon-like tungsten ions which is included in the present work. The Spectrum of neon-like tungsten near 8500 eV has been measured by Beiersdorfer et al [1] which require the reliable calculations for comparison. This is because the CIXS will provide radial profiles of the ion abundances in ITER and therefore reliable atomic data is required for using the CIXS in this endeavor.…”

Section: Introductionmentioning

confidence: 99%

Atomic data for Ne-like ions useful in plasma diagnostic

2018

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Motived by the recent measurement of transition lines for Ne-like Hf and W, we have reported atomic data in the form of multiconfiguration Dirac–Fock transition energies and wavefunction compositions of 209 levels belonging to the configurations 2s22p6, 2s22p5ns (n = 3, 4, 5, 6, 7), 2s22p5np (n = 3, 4, 5, 6, 7), 2s22p5nd (n = 3, 4, 5, 6, 7), 2s22p5nf (n = 4, 5), 2s22p55g, 2s2p6ns (n = 3, 4, 5), 2s2p6np (n = 3, 4, 5), 2s2p6nd (n = 3, 4, 5), 2s2p6nf (n = 4, 5), and 2s2p65g of Hf LXIII, Ta LXIV, W LXV, and Re LXVI. Radiative rates, oscillator strengths, transition wavelengths, and line strengths have been calculated for ground state electric dipole (E1) transition among these levels. These values were obtained using GRASP (general-purpose relativistic atomic structure package) code, which includes Breit and QED effects along with Dirac–Fock potential and second-order Coulomb interaction. We have compared our results with the data compiled using FAC (flexible atomic code) and also with the recent results available in the literature. The accuracy of the data is assessed. We predict new energy levels, oscillator strength, and transition probability data, where no other theoretical or experimental results are available, which will form the basis for future experimental work.

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“…Although it resists vaporization, highly-charged ions of tungsten can emerge in fusion plasma and consequently decrease its temperature due to radiation. Therefore both experimental and theoretical physicists show a surging interest in tungsten spectroscopic properties [1][2][3]. The theoretical and experimental studies of the tungsten ions are important in fusion plasma research, but available spectroscopic data for the ions with an open 4p N shell are incomplete.…”

Section: Introductionmentioning

confidence: 99%

Radiative transitions for three lowest configurations of tungsten ions W38+–W43+

Karpuškienė¹,

Bogdanovich²,

Kisielius³

2017

Lith. J. Phys.

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The ab initio quasirelativistic approximation was used to derive transition data for the multicharged tungsten ions W 38+ -W43+ with an open 4p shell. The configuration interaction method with transformed radial orbitals was applied to include electron correlation effects. The relativistic effects were taken into account in the Breit-Pauli approximation for the quasirelativistic Hartree-Fock radial orbitals. The level energies E, radiative lifetimes τ, and Landé g-factors were calculated for the 4s 4d, and 4s4pN+1 configurations of six tungsten ions. The radiative transition wavelengths λ, spontaneous emission transition probabilities A and their uncertainties for the electric dipole, electric quadrupole, electric octupole, magnetic dipole and magnetic quadrupole transitions among the levels of these configurations are presented.

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Tungsten Data for Current and Future Uses in Fusion and Plasma Science

Cited by 29 publications

References 84 publications

Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten

Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten

Atomic data for Ne-like ions useful in plasma diagnostic

Radiative transitions for three lowest configurations of tungsten ions W38+–W43+

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