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Bulletin of the American Physical Society

Ion friction in dual species ultracold plasma expansion

Tucker Sprenkle, Ross L. Spencer, Scott Bergeson

Published Jun 1, 2018• 0 citations
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Abstract Based on fluid model, the three-dimensional expansion of ultracold plasma is studied. The model considered both thermal pressure and ambipolar potential rising due to the local charge separation. By using isothermal assumption and quasi-neutrality condition, the time dependent asymetric expansion parametric investigation is conducted for two different ultracold plasma ion species (Sr + and Ca + ). It is found that ion temperature, in the range of ultracold limit, did not affect strongly the expanding profile but decreases the expanding density by an amount of ∼0.5% to ∼7%.The ion inertia is also found to enhance the asymetric aspect of the anisotrpic plasma expansion.

Physica Scripta•Nov 15, 2019•0 citations
We create a dual-species ultracold neutral plasma (UNP) by photo-ionizing Yb and Ca atoms in a dual-species magneto-optical trap. Unlike single-species UNP expansion, these plasmas are well outside of the collisionless (Vlasov) approximation. We observe the mutual interaction of the Yb and Ca ions by measuring the velocity distribution for each ion species separately. We model the expansion using a fluid code including ion-ion friction and compare with experimental results to obtain a value of the Coulomb logarithm of Λ= 0.04.
Abstract Based on fluid model, the three-dimensional expansion of ultracold plasma is studied. The model considered both thermal pressure and ambipolar potential rising due to the local charge separation. By using isothermal assumption and quasi-neutrality condition, the time dependent asymetric expansion parametric investigation is conducted for two different ultracold plasma ion species (Sr + and Ca + ). It is found that ion temperature, in the range of ultracold limit, did not affect strongly the expanding profile but decreases the expanding density by an amount of ∼0.5% to ∼7%.The ion inertia is also found to enhance the asymetric aspect of the anisotrpic plasma expansion.