Radiative and inner-shell dielectronic recombination in a highly charged barium ion

McLaughlin, Daniel J.; Hahn, Yukap; Takács, Endre; Meyer, E. S.; Gillaspy, John D.

doi:10.1103/physreva.54.2040

Cited by 20 publications

(14 citation statements)

References 15 publications

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“…EBIT is a versatile light source, capable of producing nearly any ion charge state of nearly any element. A fine control of the charge state distribution in the trap is due to a very narrow electron energy distribution function (EEDF) of the beam (width 60 eV) [5]. A detailed description of the NIST EBIT can be found elsewhere [6].…”

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confidence: 99%

EUV spectra of highly-charged ions W⁵⁴⁺–W⁶³⁺relevant to ITER diagnostics

Ralchenko

Draganić

Tan

et al. 2008

J. Phys. B: At. Mol. Opt. Phys.

118

116

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We report the first measurements and detailed analysis of extreme ultraviolet (EUV) spectra (4 nm to 20 nm) of highly-charged tungsten ions W 54+ to W 63+ obtained with an electron beam ion trap (EBIT). Collisional-radiative modelling is used to identify strong electric-dipole and magnetic-dipole transitions in all ionization stages. These lines can be used for impurity transport studies and temperature diagnostics in fusion reactors, such as ITER. Identifications of prominent lines from several W ions were confirmed by measurement of isoelectronic EUV spectra of Hf, Ta, and Au. We also discuss the importance of charge exchange recombination for correct description of ionization balance in the EBIT plasma.

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mentioning

confidence: 99%

EUV spectra of highly-charged ions W⁵⁴⁺–W⁶³⁺relevant to ITER diagnostics

Ralchenko

Draganić

Tan

et al. 2008

J. Phys. B: At. Mol. Opt. Phys.

118

116

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“…There are two possible meanings of "beam temperature": (1) overall beam temperature, or full energy spread, and (b) transverse beam temperature. Regarding the first, the paper cited by LLNL in [15] concerning this issue determined their beam temperature to be 50 eV [22], larger than the 45 eV value determined previously for the NIST EBIT [23]. The actual value for the NIST EBIT during the Fe XVII experiment is likely to have been even less since we operated at reduced beam currents (one component of the temperature is proportional to the space charge, which scales linearly with beam current).…”

Section: X-ray Microcalorimetrymentioning

confidence: 72%

Visible, EUV, and X-ray Spectroscopy at the NIST EBIT Facility

Gillaspy¹

2004

AIP Conference Proceedings

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After a brief introduction to the NIST EBIT facility, we present the results of three different types of experiments that have been carried out there recently: EUV and visible spectroscopy in support of the microelectronics industry, laboratory astrophysics using an x-ray microcalorimeter, and charge exchange studies using extracted beams of highly charged ions. THE NIST EBIT FACILITY: HISTORY AND OVERVIEWElectron Beam Ion Traps (EBITs) emerged on the world scene in 1988 with the publication of the first results by the Livermore-LBL collaboration [1]. Results that depended critically on high-resolution x-ray spectroscopy with an EBIT appeared in the Physical Review in 1989 [2], using an NRL-NIST spectrometer at Livermore, in collaboration with P. Beiersdorfer. This work followed some other important EBIT high-resolution spectroscopy work presented earlier in various conference proceedings. Two years later, construction of a new EBIT laboratory at NIST began, in collaboration with NRL, and two years after that (1993) we began trapping ions and publishing papers from the NIST facility. A compilation of the early Livermore EBIT papers was published in 1992 [3]. Recently, we published a bound collection of the NIST EBIT publications through 2001, which is available in hardcopy and CD from NIST [4]. The NIST compilation also contains some previously unpublished historical information about both the NIST and LLNL EBITs (written by the first author of the present paper, and by Ross Marrs of LLNL).The NIST EBIT incorporates a number of design changes that are intended to allow it to reach higher beam energies than those obtained in the EBIT-I and EBIT-II at

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“…The NIST experiment has been described previously [3]. In summary, a strong X-ray emission peak was observed at 4.6 keV, and several smaller peaks were measured at Xray energies in the range 2.4 keV4 44.3 keV.…”

Section: Introductionmentioning

confidence: 88%

Analysis of low energy X-ray and excitation spectra of Ba 35+

McLaughlin

Hahn

1996

Z Phys D - Atoms, Molecules and Clusters

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We present a theoretical analysis of the low energy X-ray spectra of the Ba>#e\ system, in the energy region below 2 keV, for comparison with future experiments. In a recent study carried out at the National Institute of Standards and Technology, scandium-like Ba> ions were created, trapped and excited using an Electron Beam Ion Trap and an electron beam with kinetic energy of 2.35 keV. The theory agrees well with experiment for X-ray energies in the region 2-5 keV. The experiment also gives evidence suggestive of a large cross section for X-ray production in the region below 2.0 keV. We include the contribution to the X-ray spectra of collisional excitation followed by fluorescence decay, radiative cascade processes, M-shell dielectronic recombination, Bremsstrahlung, and a new off-shell, quasi-resonant continuum dielectronic recombination process. We find that excitation fluorescence is the dominant process, with smaller contributions from the other radiative cascade processes as well as a continuous Bremsstrahlung background.

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Radiative and inner-shell dielectronic recombination in a highly charged barium ion

Cited by 20 publications

References 15 publications

EUV spectra of highly-charged ions W⁵⁴⁺–W⁶³⁺relevant to ITER diagnostics

EUV spectra of highly-charged ions W⁵⁴⁺–W⁶³⁺relevant to ITER diagnostics

Visible, EUV, and X-ray Spectroscopy at the NIST EBIT Facility

Analysis of low energy X-ray and excitation spectra of Ba 35+

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Radiative and inner-shell dielectronic recombination in a highly charged barium ion

Cited by 20 publications

References 15 publications

EUV spectra of highly-charged ions W54+–W63+relevant to ITER diagnostics

EUV spectra of highly-charged ions W54+–W63+relevant to ITER diagnostics

Visible, EUV, and X-ray Spectroscopy at the NIST EBIT Facility

Analysis of low energy X-ray and excitation spectra of Ba 35+

Contact Info

Product

Resources

About

EUV spectra of highly-charged ions W⁵⁴⁺–W⁶³⁺relevant to ITER diagnostics

EUV spectra of highly-charged ions W⁵⁴⁺–W⁶³⁺relevant to ITER diagnostics