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Bulletin of the American Physical Society

Kinetic Energy Oscillations during Disorder Induced Heating in an Ultracold Plasma

Thomas Langin, Patrick McQuillen, Trevor Strickler, Thomas Pohl, T. C. Killian

Published Jun 10, 2015• 0 citations
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Universality in the Equilibration of Quenched Yukawa One Component Plasmas

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A Yukawa one-component plasma (OCP) is an idealized model in which particles interact through a 1/r potential with an additional exponential falloff with length scale 1/κ expressed in units of the average interparticle spacing. This model is used to approximately describe a wide range of physical systems, especially strongly coupled plasmas; i.e., those which have Γ≥1, where Γ is the ratio of the Coulomb interaction energy between neighboring particles to the kinetic energy per particle. All dynamics and physical properties in Yukawa OCPs are expected to be universal in κ when expressed in appropriate scaled units. We study a particularly clean realization of the Yukawa OCP, an ultracold neutral plasma (UNP) created by photoionization of an ultracold atomic gas. The rapid quench to a UNP results in an equilibration process known as Disorder Induced Heating (DIH). Even after DIH the plasma is strongly coupled, with Γ~3. During DIH, oscillations in 1/Γ (i.e. scaled Kinetic Energy) occurring at twice the plasma frequency, ω_{pi}, are observed, possibly indicating coupling to collective modes. Universality is demonstrated by showing that 1/Γ(t) curves taken at similar κ collapse onto the same curve when plotted vs. ω_{pi}t. We also compare our results to molecular dynamics (MD) simulations. The utility of the universality is shown by using the MD simulations to determine the density from experimental DIH measurements.

Bulletin of the American Physical Society•Nov 16, 2015•0 citations

Disorder‐induced heating of ultracold plasmas

Dirk O. Gericke, Michael S. Murillo

Abstract We report calculations for the disorder‐induced heating of the ions in ultracold plasmas that were created by ionization of ultracold, trapped gases. Since the ions gain a large amount of kinetic energy while building up negative potential energy, plasmas are usually heated to a moderately coupled state that is almost independent of the initial temperature. We show how this process is related to the establishment of Coulomb structure in the final plasma state. Several possibilities for reducing the heating by the introduction of structure in the initial state, i.e., the gas before ionization, are then discussed. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Contributions to Plasma Physics•Oct 1, 2003•45 citations
A Yukawa one-component plasma (OCP) is an idealized model in which particles interact through a 1/r potential with an additional exponential falloff with length scale 1/κ expressed in units of the average interparticle spacing. This model is used to approximately describe a wide range of physical systems, especially strongly coupled plasmas; i.e., those which have Γ≥1, where Γ is the ratio of the Coulomb interaction energy between neighboring particles to the kinetic energy per particle. All dynamics and physical properties in Yukawa OCPs are expected to be universal in κ when expressed in appropriate scaled units. We study a particularly clean realization of the Yukawa OCP, an ultracold neutral plasma (UNP) created by photoionization of an ultracold atomic gas. The rapid quench to a UNP results in an equilibration process known as Disorder Induced Heating (DIH). Even after DIH the plasma is strongly coupled, with Γ~3. During DIH, oscillations in 1/Γ (i.e. scaled Kinetic Energy) occurring at twice the plasma frequency, ω_{pi}, are observed, possibly indicating coupling to collective modes. Universality is demonstrated by showing that 1/Γ(t) curves taken at similar κ collapse onto the same curve when plotted vs. ω_{pi}t. We also compare our results to molecular dynamics (MD) simulations. The utility of the universality is shown by using the MD simulations to determine the density from experimental DIH measurements.
Abstract We report calculations for the disorder‐induced heating of the ions in ultracold plasmas that were created by ionization of ultracold, trapped gases. Since the ions gain a large amount of kinetic energy while building up negative potential energy, plasmas are usually heated to a moderately coupled state that is almost independent of the initial temperature. We show how this process is related to the establishment of Coulomb structure in the final plasma state. Several possibilities for reducing the heating by the introduction of structure in the initial state, i.e., the gas before ionization, are then discussed. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)