Current Research with Highly Charged Ions in EBIT-II and SuperEBIT

Beiersdörfer, P.; Britten, J A; Brown, G. V.; Chen, H.; Clothiaux, E. J.; Cottam, J.; rster, E. F; Gu, M. F.; Harris, C. L.; Kahn, S. M.; Lepson, J. K.; Neill, P.; Savin, D. W.; Schulte‐Schrepping, H.; Schweikhard, L.; Smith, A. J.; bert, E. Tr; Tschischgale, J.; Utter, S. B.; Wong, K. L.

doi:10.1238/physica.topical.092a00268

Cited by 5 publications

(6 citation statements)

References 23 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From this analysis we obtained the Gaussian broadening Γ Exp. G =80.5 (46) meV [2]. This value also provides the depth of the trapping potential due to the electron space charge.…”

Section: A Evaluation Of the Widthsmentioning

confidence: 99%

“…Accurate transition energy measurements in medium and high-Z, few-electron ions have been reported using either Electron Beam Ion Trap (EBIT) or Electron-Cyclotron Ion Sources (ECRIS) to produce ions at rest in the laboratory. Such measurements, using an EBIT, have been performed by the Livermore group (see, e.g., [8,[44][45][46][47] and reference there in), Heidelberg group [1,4,9,48] and the Melbourne and National Institute of Standards and Technology (NIST) collaboration [3,5,6]. The present collaboration has reported values using an ECRIS [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

et al. 2018

View full text Add to dashboard Cite

We performed a reference-free measurement of the transition energies of the 1s2p 1 P 1 → 1s 2 1 S 0 line in He-like argon, and of the 1s2s 2 2p 1 P 1 → 1s 2 2s 2 1 S 0 line in Be-like argon ions. The highlycharged ions were produced in the plasma of an Electron-Cyclotron Resonance Ion Source. Both energy measurements were performed with an accuracy better than 3 parts in 10 6 , using a double flat-crystal spectrometer, without reference to any theoretical or experimental energy. The 1s2s 2 2p 1 P 1 → 1s 2 2s 2 1 S 0 transition measurement is the first reference-free measurement for this core-excited transition. The 1s2p 1 P 1 → 1s 2 1 S 0 transition measurement confirms recent measurement performed at the Heidelberg Electron-Beam Ion Trap (EBIT). The width measurement in the He-like transition provides test of a purely radiative decay calculation. In the case of the Be-like argon transition, the width results from the sum of a radiative channel and three main Auger channels. We also performed Multiconfiguration Dirac-Fock (MCDF) calculations of transition energies and rates and have done an extensive comparison with theory and other experimental data. For both measurements reported here, we find agreement with the most recent theoretical calculations within the combined theoretical and experimental uncertainties.

show abstract

“…From this analysis we obtained the Gaussian broadening Γ Exp. G =80.5 (46) meV [2]. This value also provides the depth of the trapping potential due to the electron space charge.…”

Section: A Evaluation Of the Widthsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

et al. 2018

View full text Add to dashboard Cite

show abstract

“…An M-shell survey of W ions was performed at the Lawrence Livermore National Laboratory using the EBIT-II electron-beam ion trap [12]. The trapped W ions reach a charge-state limit when the electron Fig.…”

Section: Experimental M-shell Spectra In the Spectral Region From 5 Tmentioning

confidence: 99%

The study of X-ray M-shell spectra of W ions from the Lawrence Livermore National Laboratory Electron Beam Ion Trap

Neill¹,

Harris²,

Safronova³

et al. 2004

Can. J. Phys.

View full text Add to dashboard Cite

M-shell spectra of W ions have been produced at the Lawrence Livermore National Laboratory EBIT-II electron beam ion trap-II at different energies of the electron beam. A survey has been performed at 2.4, 2.8, and 3.6 keV, and for steps in energy of 100 eV over the 3.94.6 keV energy range. The analysis of 11 W spectra has shown the presence of a wide variety of ionization stages from Se-like to Cr-like W; the appearances of these ionization stages correlate well with the energy of their production. The present paper focuses on the identification of 63 experimental features of W ions in a spectral region from 5 to 6 Å (1 Å = 1010 m) using calculations with inclusion of all ionization stages matching this spectral region. The majority of lines in all spectra have been identified and assigned to the 4f → 3d and 4d → 3p transitions. This is the first work that lists a comprehensive identification of so many resolved spectral features of X-ray M-shell transitions in W ions recorded in such detail in the laboratory. PACS Nos.: 52.58.Lq,32.30.Rj,52.70.La

show abstract

“…In fact, the first Electron Beam Ion Trap (EBIT-I) at the Lawrence Livermore National Laboratory was primarily designed as an X-ray source for spectroscopy. This machine and its successors EBIT-II and SuperEBIT have produced a wealth of data for astrophysics, atomic physics, fusion and other fields [11][12][13]. Thereby, the SuperEBIT has obtained highest charge states also for very heavy ions up to helium-like uranium [14].…”

Section: Introductionmentioning

confidence: 99%

“…Crystal spectrometers use the dispersion of X-rays in a silicon crystal in combination with a position-sensitive detector. Several of these crystal spectrometers are in use at EBITs at Livermore [11,12], Heidelberg [28,29] or others [30,31]. Excellent energy resolution of ∆E/E ∼ 10 −3 − 10 −4 has been obtained in the energy range of 1-30 keV.…”

Section: Introductionmentioning

confidence: 99%

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Kraft‐Bermuth

Hengstler

Egelhof

et al. 2018

Atoms

View full text Add to dashboard Cite

X-ray spectroscopy of highly charged heavy ions is an important tool for the investigation of many topics in atomic physics. Such highly charged ions, in particular hydrogen-like uranium, are investigated at heavy ion storage rings, where high charge states can be produced in large quantities, stored for long times and cooled to low momentum spread of the ion beam. One prominent example is the determination of the 1s Lamb Shift in hydrogen-like heavy ions, which has been investigated at the Experimental Storage Ring (ESR) at the GSI Helmholtz Centre for Heavy Ion Research. Due to the large electron binding energies, the energies of the corresponding photon transitions are located in the X-ray regime. To determine the transition energies with high accuracy, highly resolving X-ray spectrometers are needed. One concept of such spectrometers is the concept of microcalorimeters, which, in contrast to semiconductor detectors, uses the detection of heat rather than charge to detect energy. Such detectors have been developed and successfully applied in experiments at the ESR. For experiments at the Facility for Antiproton and Ion Research (FAIR), the Stored Particles and Atoms Collaboration (SPARC) pursues the development of new microcalorimeter concepts and larger detector arrays. Next to fundamental investigations on quantum electrodynamics such as the 1s Lamb Shift or electron–electron interactions in two- and three-electron systems, X-ray spectroscopy may be extended towards nuclear physics investigations like the determination of nuclear charge radii.

show abstract

Current Research with Highly Charged Ions in EBIT-II and SuperEBIT

Cited by 5 publications

References 23 publications

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

The study of X-ray M-shell spectra of W ions from the Lawrence Livermore National Laboratory Electron Beam Ion Trap

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Contact Info

Product

Resources

About