Systematic investigation of a magnetic ion source for an electromagnetic isotope separator

Almén, O.; Nielsen, K.O.

doi:10.1016/0369-643x(57)90026-9

Cited by 116 publications

(15 citation statements)

References 9 publications

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“…5 The previous models used to estimate the ionization efficiencies assumed either a thermalized plasma with an average electron temperature of ϳ3 eV ͑Ref. 8͒ or the recirculation of the primary electrons inside the source volume, 9,10 producing several ionizations until their energy drops below the ionization potential of the atoms present in the plasma.…”

Section: B Theoretical Analysismentioning

confidence: 99%

Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Penescu

Catherall

Lettry

et al. 2010

Review of Scientific Instruments

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We report here recent developments of Forced Electron Beam Impact Arc Discharge (FEBIAD) ion sources at CERN-ISOLDE. As a result of the propositions to improve the ionization efficiency, two FEBIAD prototypes have been produced and successfully tested in 2008. Off-line studies showed that the 1+ ionization efficiencies for noble gases are 5 to 20 times larger than with the standard ISOLDE FEBIAD ion sources, and reach 60% for Radon, which allowed the identification at ISOLDE of 229 Rn, an isotope that had never previously been observed in the laboratory. A factor 3 increase is also expected for the ionization efficiency of the other elements. The experimental and theoretical methodology is presented. The theoretical model which gives precise insights on the processes affecting the ionization is used to design optimal sources for the different chemical classes of the produced isotopes, as already demonstrated for noble gases.

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Section: B Theoretical Analysismentioning

confidence: 99%

Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Penescu

Catherall

Lettry

et al. 2010

Review of Scientific Instruments

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“…In brief, the interaction between ions and photons was obtained by overlapping a synchrotron-radiation beam from an undulator with a 2 keV beam of C`ions over a distance of 50 cm, and the photoionization cross section was determined from the photoionization yield of C2`ions. The C`ions, of which D95% were in the 2s22p 2P ground state and the rest in the 2s2p2 4P metastable state, were produced in a Nielsen type ion source (Almen & Nielsen 1957), accelerated to 2 keV and then deÑected by an electromagnet which allowed only C`ions to pass. The ion beam was subsequently collimated by two apertures and deÑected onto the same path as the photons by an electrostatic deÑector.…”

Section: Methodsmentioning

confidence: 99%

The Absolute Cross Section forL‐Shell Photoionization of C⁺Ions from Threshold to 105 eV

Kjeldsen

Hansen

Folkmann

et al. 2001

ASTROPHYS J SUPPL S

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The absolute cross section for photoionization of C`ions has been measured from the ionization threshold at 24 eV to 105 eV by overlapping an ion beam with a monochromatized synchrotronradiation beam from the ASTRID undulator. The measurements, which are important for astrophysical modeling of, for example, stellar atmospheres, have been compared with R-matrix calculations from the Opacity Project and the Iron Project. The general agreement between theory and experiment is good, yet di †erences in the magnitude of the cross section of up to 50% are observed as well as some deviations concerning the resonance structure.

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“…Accuracy on the photon energy scale is estimated to be 20 meV. Kr + and Xe + target ions are produced using a hot-filament plasma ion source of the Nielsen type [31]. The ions are extracted from the ion source and accelerated using a 2 kV extraction voltage, mass separated by a dipole magnet, collimated and merged electrostatically with the photon beam.…”

Section: Merged-beam Experimentsmentioning

confidence: 99%

Photoionization study of Kr⁺and Xe⁺ions with the combined use of a merged-beam set-up and an ion trap

Bizau

Blancard

Coreno

et al. 2011

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

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To cite this version:J M Bizau, C Blancard, M Coreno, D Cubaynes, C Dehon, et al.. Photoionization study of Kr+ and Xe+ ions with the combined use of a merged-beam set-up and an ion trap. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2011, 44 (5) Introduction:Atomic physics provides unique tools for plasma diagnostics. In particular, based on photoionization studies on ionic species one can deduce essential spectroscopic data for the determination of important plasma parameters such as abundance and temperature. In addition, dipole selection rules allow further simplification of the data by reducing the number of allowed transitions. To be useful, quantities like the energies and oscillator strengths of discrete lines or direct photoionization cross sections must be measured in absolute value with high accuracy for a large number of ionic species and over a wide range of photon energy. Photoionization is also one of the main processes contributing to plasma opacity and radiation transfer inside plasmas.

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Systematic investigation of a magnetic ion source for an electromagnetic isotope separator

Cited by 116 publications

References 9 publications

Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

The Absolute Cross Section forL‐Shell Photoionization of C⁺Ions from Threshold to 105 eV

Photoionization study of Kr⁺and Xe⁺ions with the combined use of a merged-beam set-up and an ion trap

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Systematic investigation of a magnetic ion source for an electromagnetic isotope separator

Cited by 116 publications

References 9 publications

Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

The Absolute Cross Section forL‐Shell Photoionization of C+Ions from Threshold to 105 eV

Photoionization study of Kr+and Xe+ions with the combined use of a merged-beam set-up and an ion trap

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The Absolute Cross Section forL‐Shell Photoionization of C⁺Ions from Threshold to 105 eV

Photoionization study of Kr⁺and Xe⁺ions with the combined use of a merged-beam set-up and an ion trap