EBIT diagnostics using X-ray spectra of highly ionized Ne

Matranga, M.; Barbera, Marco; Maggio, A.; Peres, G.; Serio, S.; Takács, Endre; Gillaspy, John D.; Schnopper, H. W.; Laming, Martin; Beeman, J. W.; Haller, E. E.; Madden, N.

doi:10.1016/s0168-583x(03)00943-1

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…The decreasing electron density below 3.4 keV is due to the lower beam current in the EBIT at low beam energies, while, above 3.4 keV, the velocity of the electrons increases as a function of beam energy with beam current remaining fairly unchanged. The normalization factor is consistent with the previous diagnostics on the NIST EBIT [35] using neon line ratios and the HULLAC code, assuming a beam radius of 35 microns and a factor of 4.6 effective density reduction due to heating of the ion cloud to significantly larger diameter than that of the electron beam [36]. The gas injection pressure was changed and the EBIT was retuned [16] several times during the experiments which may have resulted in different beam radii and hence explain some of the scatter seen.…”

Section: Effect Of the M1 Transition On Allowed Transition Intensitiessupporting

confidence: 89%

EUV measurements of Kr XXI–Kr XXXIV and the effect of a magnetic-dipole line on allowed transitions

Podpaly

Gillaspy

Reader

et al. 2014

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

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We observed and analysed the extreme-ultraviolet spectra of highly charged ions of Kr XXI–Kr XXXIV produced in an electron beam ion trap (EBIT). The beam energies varied between 1.1 and 30 keV, and the wavelengths were observed between 3 and 17.3 nm with uncertainties of ∼0.003 nm. Six new lines were identified, and wavelength uncertainties have been improved for twelve additional transitions. It was found that a line intensity ratio for allowed transitions 3s23p–3s23d in Al-like Kr XXIV strongly deviated from predictions based on statistical weighting of the excited levels. Collisional-radiative modelling showed that this effect, which is due to the magnetic-dipole transition within the ground configuration 3s23p, offers sensitive diagnostics of electron density in the regime of interest to fusion tokamaks, EBITs, and other low-density plasmas.

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Section: Effect Of the M1 Transition On Allowed Transition Intensitiessupporting

confidence: 89%

EUV measurements of Kr XXI–Kr XXXIV and the effect of a magnetic-dipole line on allowed transitions

Podpaly

Gillaspy

Reader

et al. 2014

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

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“…From equation (A.2) and the numerical values above, it can be seen that for H-like and He-like Ar exposed to a 9500 eV electron beam of effective current density n e F = 10 12 cm −3 [53,54], and v e /v i = 1400 one is in the strong charge exchange regime when n o ≫ 1.4 × 10 6 cm −3 which corresponds to a room temperature ideal gas pressure of p ≫ n o kT = 5.7 × 10 -11 hPa (4 × 10 −11 torr). This is on the order of typical EBIT base pressures (without any gas injection) and suggests that one is on the threshold of the strong charge exchange regime even when no additional gas is injected for spectroscopy.…”

Section: Pressure For Strong Charge Exchange Regimementioning

confidence: 94%

Precision spectroscopy of trapped highly charged heavy elements: pushing the limits of theory and experiment

Gillaspy¹

2014

Phys. Scr.

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Atomic spectroscopy results from the electron beam ion trap at the National Institute of Standards and Technology have generally agreed with the predictions of theory extremely well. An interesting exception is our recent result on the helium isoelectronic sequence at Z = 22, which agrees instead with a meta-analysis of all prior measurements above Z = 15, but disagrees with both theory and a contemporaneous report of an independent measurement at Z = 18 which claims to validate theory to high accuracy. Here, a potential systematic shift involving high-n satellite lines induced by double charge exchange is quantitatively estimated and shown to be potentially significant in experiments involving gasses. Suggestions for further refinements in estimating the magnitude of this systematic shift are given.

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“…A well established collaborative research program between the research team at the XACT facility and the Smithsonian Astrophysical Observatory (SAO, Cambridge, MA) is ongoing to develope and optimize high energy resolution X-ray microcalorimeter detectors for laboratory and astrophysical applications 33,34,35,36,37 . Within this collaboration an Adiabatic Demagnetization Refrigerator was designed and built at the XACT facility 16 and the read-out electronics has been set-up to operate simultaneously a four pixel array of microcalorimeters with semiconductor thermistors.…”

Section: Cryogenic Laboratorymentioning

confidence: 99%

The Palermo XACT facility: a new 35 m long soft x-ray beam-line for the development and calibration of next-generation x-ray observatories

et al. 2006

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The X-ray Astronomy Calibration and Testing (XACT) facility of the Instituto Nazionale di Astrofisica (INAF) at\ud Osservatorio Astronomico di Palermo has recently undergone a major upgrade with the design and construction of a 35\ud meter long vacuum beam-line operating in the soft X-rays (0.1-20 keV) and the addition of new hardware to meet the\ud requirements for testing and calibration of next generation X-ray missions. We report on the present configuration of\ud the facility and briefly survey the range of its applications

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EBIT diagnostics using X-ray spectra of highly ionized Ne

Cited by 7 publications

References 9 publications

EUV measurements of Kr XXI–Kr XXXIV and the effect of a magnetic-dipole line on allowed transitions

EUV measurements of Kr XXI–Kr XXXIV and the effect of a magnetic-dipole line on allowed transitions

Precision spectroscopy of trapped highly charged heavy elements: pushing the limits of theory and experiment

The Palermo XACT facility: a new 35 m long soft x-ray beam-line for the development and calibration of next-generation x-ray observatories

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