2015
DOI: 10.1063/1.4915135
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Ion temperature evolution in an ultracold neutral plasma

Abstract: We study the long-time evolution of the ion temperature in an expanding ultracold neutral plasma using spatially resolved, laser-induced-fluorescence spectroscopy. Adiabatic cooling reduces the ion temperature by an order of magnitude during the plasma expansion, to temperatures as low as 0.2 K. Cooling is limited by heat exchange between ions and the much hotter electrons. We also present evidence for an additional heating mechanism and discuss possible sources. Data are described by a model of the plasma evo… Show more

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Cited by 32 publications
(39 citation statements)
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References 88 publications
(143 reference statements)
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“…On the long timescale of temperature relaxation, UNPs are subject to other heating and cooling mechanisms (especially three-body recombination heating) that obscure the electron-ion collision physics. 24 Velocity relaxation, however, is faster than temperature relaxation by a factor of about m i /m e . This makes it a suitable probe of electron-ion collisional transport (and thus the Barkas effect), since a drift velocity can relax on a timescale that is short compared to both temperature relaxation and three-body recombination.…”
Section: Molecular Dynamics Simulationsmentioning
confidence: 96%
“…On the long timescale of temperature relaxation, UNPs are subject to other heating and cooling mechanisms (especially three-body recombination heating) that obscure the electron-ion collision physics. 24 Velocity relaxation, however, is faster than temperature relaxation by a factor of about m i /m e . This makes it a suitable probe of electron-ion collisional transport (and thus the Barkas effect), since a drift velocity can relax on a timescale that is short compared to both temperature relaxation and three-body recombination.…”
Section: Molecular Dynamics Simulationsmentioning
confidence: 96%
“…Measurements of the velocity autocorrelation function and the self-diffusion constant are performed after the DIH is complete and the plasma is near local thermal equilibrium. After DIH, the ion temperature still changes due to electron-ion heating and cooling from expansion into the vacuum [56], but this is a slow evolution compared to the experimental time scale.…”
Section: Appendix B: Variation and Uncertainties Of Plasma Parametersmentioning
confidence: 99%
“…For example, one can imagine an experiment in which the Ca plasma is generated and allowed to expand. As it expands, the ion-ion coupling parameter increases to values near 5 [56]. The co-located Yb plasma could then be generated and the interaction between the cold Ca + ions and the hot Yb + ions could be measured.…”
Section: Discussionmentioning
confidence: 99%
“…Consistent with Ref. [56] and many other UNP studies, we take the ion strong coupling parameter to be,…”
Section: A the Coulomb Logarithm And Momentum Transfermentioning
confidence: 99%
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