论文标题
稳态超低等离子体
Steady-State Ultracold Plasma
论文作者
论文摘要
强耦合的超低等离子体可以用作出色的测试平台，用于研究与各种血浆现象相关的多体相互作用。在本文中，我们讨论了一种方法，该方法可以通过连续两步的MOT中钙原子的两步光激发来创建具有各种密度和温度的稳态超低等离子体。使用激光诱导的钙离子荧光研究了血浆的参数。实验结果通过一个简单的理论模型很好地描述了，涉及通过流体动力离子流和三体重组对带电颗粒的连续源的平衡。与峰值离子密度为$ 6 \ cdot10^5 $ cm $^{ - 3} $的峰值离子密度的强耦合等离子体已经制备了2 K接近2 K的最低电子温度。我们的稳态方法与等离子体的强磁限制结合使用将使在这种系统中达到极强的耦合成为可能。
A strongly coupled ultracold plasma can be used as an excellent test platform for studying many-body interactions associated with various plasma phenomena. In this paper we discuss an approach that makes possible creation of the steady-state ultracold plasma having various densities and temperatures by means of continuous two-step optical excitation of calcium atoms in the MOT. The parameters of the plasma are studied using laser-induced fluorescence of calcium ions. The experimental results are well described by a simple theoretical model involving equilibration of the continuous source of charged particles by the hydrodynamical ion outflux and three-body recombination. The strongly coupled plasma with the peak ion density of $6\cdot10^5$ cm$^{-3}$ and the minimum electron temperature near 2 K has been prepared. Our steady-state approach in combination with the strong magnetic confinement of the plasma will make it possible to reach extremely strong coupling in such system.
