Anisotropic ultracold plasma expansion

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.