Evaporative cooling of highly charged dysprosium ions in an enhanced electron-beam ion trap

Penetrante, B. M.; Bardsley, J. N.; Levine, Morton A.; Knapp, D. A.; Marrs, R. E.

doi:10.1103/physreva.43.4873

Cited by 55 publications

(30 citation statements)

References 19 publications

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“…In an EBIT, the resolution in recombination measurements is limited by the energetically broadened electron beam [29,30]. Earlier experiments used low electron beam currents for minimizing the absolute space charge potential, its width, as well as the ion heating caused by electron impact [30].…”

Section: Methodsmentioning

confidence: 99%

Major role of multielectronicK-Lintershell resonant recombination processes in Li- to O-like ions of Ar, Fe, and Kr

et al. 2013

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Dielectronic and higher-order resonant electron recombination processes including a K-shell excitation were systematically measured at high resolution in electron beam ion traps. Storing highly charged Ar, Fe, and Kr ions, the dependence on atomic number Z of the contribution of these processes to the total recombination cross section was studied and compared with theoretical calculations. Large higher-order resonant recombination contributions are found, especially for systems with 10 < Z < 36. In some cases, they even surpass the strength of the dielectronic channel, which was hitherto presumed to be always the dominant one. These findings have consequences for the modeling of high-temperatur plasmas. Features attributed to inter-shell quadruelectronic recombination were also observed. The experimental data obtained for the He-like to O-like isoelectronic sequences compare well with the results of advanced relativistic distorted-wave calculations employing multiconfiguration Dirac-Fock bound state wave functions that include threefold and fourfold excitations.

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Section: Methodsmentioning

confidence: 99%

Major role of multielectronicK-Lintershell resonant recombination processes in Li- to O-like ions of Ar, Fe, and Kr

et al. 2013

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“…One of the first steps towards these goals was the experimental realization of a highly charged ion crystal in a precision trap that was filled with ions from an EBIT [26,27]. Some of the cooling schemes applicable to highly charged ions have already been put into operation in an EBIT [28][29][30].…”

Section: Highly Charged Ion Beams and Cloudsmentioning

confidence: 99%

“…Conventional evaporative cooling in an EBIT [67][68][69], as described above, differs from evaporative cooling in neutral atom taps in that there is no time-dependence of the trap potentials. This cooling is not lossy because it depends on collisions with lower charge state ions that "see" a different trap depth.…”

Section: Evaporative Coolingmentioning

confidence: 99%

Trapped highly charged ion plasmas

Takács¹,

Gillaspy²

2002

AIP Conference Proceedings

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Abstract. Electron Beam Ion Trap (EBIT) devices and their special features are reviewed with attention to applications in highly charged ion plasma research. EBIT properties are presented based on information extracted from a variety of experiments reported in the literature. Topics discussed include typical parameters (Debye length, Wigner-Seitz radius, Coulomb coupling parameter, density, temperature, etc.), magnetic trapping mode, ion cloud shape, rotation, and evaporative cooling. We conclude that the quantitative understanding of highly charged ion plasmas inside an EBIT requires improved modeling and advanced diagnostic techniques.

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“…Precise adjustment of the gas injector ensures that the atoms or molecules intersect the electron beam, where they get ionized and trapped. A continuous injection of low-Z elements, such as nitrogen or neon, is very important for the evaporative cooling of the collisiondy heated highly charged ions [6]. Recently, a technique has been developed which allows to inject materials which are available only in trace quantities [7].…”

Section: Introductionmentioning

confidence: 99%