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The European Physical Journal D

Kinetic energy oscillations in annular regions of ultracold neutral plasmas

S. Laha, Ying-Cheng Chen, Priya Gupta, Clayton E. Simien, Y. N. Martinez, Pascal G. Mickelson, Sarah Nagel, T. C. Killian

Published Jun 14, 2006• 18 citations
Publisher
DOI
10.1140/epjd/e2006-00131-2

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Annular analysis of fluorescence imaging measurements on Ultracold Neutral Plasmas (UNPs) is demonstrated. Spatially‐resolved fluorescence imaging of the strontium ions produces a spectrum that is Doppler‐broadened due to the thermal ion velocity and shifted due to the ion expansion velocity. The fluorescence excitation beam is spatially narrowed into a sheet, allowing for localized analysis of ion temperatures within a volume of the plasma with small density variation. Annular analysis of fluorescence images permits an enhanced signal‐to‐noise ratio compared to previous fluorescence measurements done in strontium UNPs. Using this technique and analysis, plasma ion temperatures are measured and shown to display characteristics of plasmas with strong coupling such as disorder induced heating and kinetic energy oscillations.
Ultracold neutral plasmas occupy an exotic regime of plasma physics in which electrons form a swarming, neutralizing background for ions that sluggishly move in a correlated manner. Strong interactions between the charged particles give rise to surprising dynamics such as oscillations of the average kinetic energy during equilibration and extremely fast recombination. Such phenomena offer stimulating and challenging problems for computational scientists, and the physics can be applied to other environments, such as the interior of gas giant planets and plasmas created by short-pulse laser irradiation of solid, liquid, and cluster targets.