Star clusters dynamics in a laboratory: electrons in an ultracold plasma

Abstract

Electrons in a spherical ultracold quasineutral plasma at temperature in the Kelvin range can be created by laser excitation of an ultra-cold laser cooled atomic cloud. The dynamical behavior of the electrons is similar to the one described by conventional models of stars clusters dynamics. The single mass component, the spherical symmetry and no stars evolution are here accurate assumptions. The analog of binary stars formations in the cluster case is three-body recombination in Rydberg atoms in the plasma case with the same Heggie's law: soft binaries get softer and hard binaries get harder. We demonstrate that the evolution of such an ultracold plasma is dominated by Fokker-Planck kinetics equations formally identical to the ones controlling the evolution of a stars cluster. The Virial theorem leads to a link between the plasma temperature and the ions and electrons numbers. The Fokker-Planck equation is approximate using gaseous and fluid models. We found that the electrons are in a Kramers-Michie-King's type quasi-equilibrium distribution as stars in clusters. Knowing the electron distribution and using forced fast electron extraction we are able to determine the plasma temperature knowing the trapping potential depth.

Submitted to MNRAS

References in corpus (12)

• Using Absorption Imaging to Study Ion Dynamics in an Ultracold Neutral Plasma
• Coulomb crystallization in expanding laser-cooled neutral plasmas
• Kinetic modelling and molecular dynamics simulation of ultracold neutral plasmas including ionic correlations
• Electron Temperature of Ultracold Plasmas
• Plasma formation from ultracold Rydberg gases
• A stochastic Monte Carlo approach to model real star cluster evolution, III. Direct integrations of three- and four-body interactions
• Ionization of Rydberg atoms embedded in an ultracold plasma
• On the possibility of "correlation cooling" of ultracold neutral plasmas
• Molecular effects in the ionization of N${}_2$, O${}_2$ and F${}_2$ by intense laser fields
• Theory of evaporative cooling with energy-dependent elastic scattering cross section and application to metastable helium
• Influence of electron-ion collisions on Coulomb crystallization of ultracold neutral plasmas
• If 1=2+3, then 1=2.3: Bell states, finite groups, and mutually unbiased bases, a unifying approach

Cited by in corpus (6)

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• Ultracold Neutral Plasmas
• On the formation and decay of a molecular ultracold plasma
• Dissipative dynamics of atomic and molecular Rydberg gases: Avalanche to ultracold plasma states of strong coupling
• Electron Evaporation from an Ultracold Plasma in a Uniform Electric Field
• A scalable theoretical mean-field model for the electron component of an ultracold neutral plasma