Experimental and theoretical study of the ground-state<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi></mml:math>1 transition in Ag-like tungsten

Fei, Z.; Zhao, Runze; Shi, Zhongzhi; Xiao, Jun; Qiu, Meng; Grumer, Jon; Andersson, Martin; Brage, Tomas; Hutton, R.; Zou, Yaming

doi:10.1103/physreva.86.062501

Cited by 41 publications

(76 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, there is a shift towards longer wavelengths in the calculations, and second, the transition arrays are too wide in the synthetic spectra. It may be possible to correct for these differences by including more correlation, such as core-core (CC) correlation [11], but since we are aiming for CR modeling with a large number of atomic properties, we have to limit the size of our atomic structure model. It is clear, however, that the features of the synthetic spectra can be used to identify the transition arrays appearing for each of the tungsten charge states.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Tungsten spectroscopy in the EUV range observed at a high-temperature superconducting electron-beam ion trap

Shi

Yang

et al. 2015

Phys. Rev. A

View full text Add to dashboard Cite

We have recorded extreme ultraviolet spectra from W 11+ to W 15+ ions using a flat-field spectrometer installed at the Shanghai high-temperature superconducting electron-beam ion trap. The spectra were recorded at beam energies ranging between 200 and 400 eV and showed spectral lines and transition arrays in the 170-260Å region. The charge states and spectra transitions were identified by comparison with calculations using a detailed relativistic configuration interaction method and collisional-radiative model, both incorporated in the flexible atomic code. Atomic structure calculations showed that the dominant emission arises from 5d → 5p and 5p → 5s transitions. The work also identified the ground-state configuration of W 13+ as 4f 13 5s 2 both theoretically and experimentally.

show abstract

Section: Resultsmentioning

confidence: 99%

“…In previous papers we have investigated visible M1 transitions in W 13+ [8], W 25+ [9], W 26+ [10], W 27+ [11] (with an extension to the silver isoelectronic sequence [12,13]), and W 28+ [14]. In the present work we report on a study of tungsten ions in the wavelength region of interest to ITER divertor diagnostics, i.e., 150-400Å.…”

Section: Introductionmentioning

confidence: 96%

Tungsten spectroscopy in the EUV range observed at a high-temperature superconducting electron-beam ion trap

Shi

Yang

et al. 2015

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…[5] and further investigated in this work. Finally, (c) it is also possible that the results could be useful as a test of quantumelectrodynamical effects.…”

Section: Introductionmentioning

confidence: 94%

Coronal lines and the importance of deep-core–valence correlation in Ag-like ions

et al. 2014

View full text Add to dashboard Cite

We report on large-scale and critically evaluated ab initio multiconfiguration Dirac-Hartree-Fock calculations of the wavelength and transition rate of the "coronal," M1 transition 4f 2 F o 5/2 -2 F o 7/2 in Ag-like ions. The transition between these two fine-structure levels, which makes up the ground term for Z 62 in the isoelectronic sequence, has recently been observed in Yb 23+ and W 27+ , where the latter could be of great importance for fusion plasma diagnostics. We present values for all members of the sequence between Z = 50 and 94, which are supported by excellent agreement with values from recent experiments. The importance of including core-valence correlation with the n = 3 shell in the theoretical model is emphasized. The results show close-to-spectroscopic accuracy for these forbidden lines.

show abstract

“…Detailed laboratory measurements on tungsten ions are well suited for electron beam ion traps (EBITs), where charge-state selection is good and the ion temperature and electron density low. Several studies of tungsten in various ionization stages and spectral ranges have been conducted using EBITs; see, e.g., [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Although designed to have a very wide electron-beam energy range, EBITs have mostly been used at energies above several hundred electron volts, leading to a focus on highly or moderately charged ions with little attention on the first few charge states.…”

Section: Introductionmentioning

confidence: 99%

Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics

Clementson

Lennartsson

Beiersdörfer

2015

Atoms

View full text Add to dashboard Cite

The extreme ultraviolet (EUV) emission from few-times ionized tungsten atoms has been experimentally studied at the Livermore electron beam ion trap facility. The ions were produced and confined during low-energy operations of the EBIT-I electron beam ion trap. By varying the electron-beam energy from around 30-300 eV, tungsten ions in charge states expected to be abundant in tokamak divertor plasmas were excited, and the resulting EUV emission was studied using a survey spectrometer covering 120-320 Å. It is found that the emission strongly depends on the excitation energy; below 150 eV, it is relatively simple, consisting of strong isolated lines from a few charge states, whereas at higher energies, it becomes very complex. For divertor plasmas with tungsten impurity ions, this emission should prove useful for diagnostics of tungsten flux rates and charge balance, as well as for radiative cooling of the divertor volume. Several lines in the 194-223 Å interval belonging to the spectra of five-and seven-times ionized tungsten (Tm-like W VI and Ho-like W VIII) were also measured using a high-resolution spectrometer.

show abstract

Experimental and theoretical study of the ground-stateM1 transition in Ag-like tungsten

Cited by 41 publications

References 23 publications

Tungsten spectroscopy in the EUV range observed at a high-temperature superconducting electron-beam ion trap

Tungsten spectroscopy in the EUV range observed at a high-temperature superconducting electron-beam ion trap

Coronal lines and the importance of deep-core–valence correlation in Ag-like ions

Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics

Contact Info

Product

Resources

About