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Adiabatic Cooling and Electron-Ion Collisions during Self-Similar Expansion in Ultracold Neutral Plasmas

Jose Castro, Hong Xiu Gao, T. C. Killian

Bulletin of the American Physical SocietyMay 30, 20080 citations

Laser-cooling ions in an ultracold neutral plasma

Daniel W. Crunkleton, Kyle P. Schneider, Kade Bishop +1 more

Bulletin of the American Physical SocietyJun 9, 20150 citations

Impact of Hydrodynamic Expansion on Laser Cooling of an Ultracold Neutral Plasma

Thomas Langin, Grant M. Gorman, T. C. Killian

Bulletin of the American Physical SocietyJun 1, 20180 citations

Laser-cooling calcium ions in an ultracold neutral plasma

Stephen Rupper, Scott Bergeson

Bulletin of the American Physical SocietyNov 1, 20160 citations

Ion temperature evolution in an ultracold neutral plasma

P. McQuillen, T. Strickler, T. Langin +1 more

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 evolution, including the effects of ion-electron heat exchange. We show that for appropriate initial conditions, the degree of Coulomb coupling of ions in the plasma increases during expansion.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 evolution, including the effects of ion-electron heat exchange. We show that for appropriate initial conditions, the degree of Coulomb coupling of ions in the plasma increases during expansion.

arXiv:1501.06944Physics of PlasmasMar 1, 201533 citations

Influence of electron–ion collisions on Coulomb crystallization of ultracold neutral plasmas

Thomas Pohl, Thomas Pattard, Jan Michael Rost

While ion heating by elastic electron-ion collisions may be neglected for a description of the evolution of freely expanding ultracold neutral plasmas, the situation is different in scenarios where the ions are laser-cooled during the system evolution. We show that electron-ion collisions in laser-cooled plasmas influence the ionic temperature, decreasing the degree of correlation obtainable in such systems. However, taking into account the collisions increases the ion temperature much less than what would be estimated based on static plasma clouds neglecting the plasma expansion. The latter leads to both adiabatic cooling of the ions as well as, more importantly, a rapid decrease of the collisional heating rate.While ion heating by elastic electron-ion collisions may be neglected for a description of the evolution of freely expanding ultracold neutral plasmas, the situation is different in scenarios where the ions are laser-cooled during the system evolution. We show that electron-ion collisions in laser-cooled plasmas influence the ionic temperature, decreasing the degree of correlation obtainable in such systems. However, taking into account the collisions increases the ion temperature much less than what would be estimated based on static plasma clouds neglecting the plasma expansion. The latter leads to both adiabatic cooling of the ions as well as, more importantly, a rapid decrease of the collisional heating rate.

arXiv:physics/0410016Journal of Physics B Atomic Molecular and Optical PhysicsJan 6, 200523 citations

Adiabatic expansion cooling of ions in ultracold neutral plasmas

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