流动超冷中性等离子体动力学行为的出现
Emergence of Kinetic Behavior in Streaming Ultracold Neutral Plasmas
摘要：
我们通过调整产生等离子体的光致电离激光束来产生流动的超冷中性等离子体。通过改变电子温度，我们控制的相对速度的流动人口，并结合等离子体密度的变化，这控制离子碰撞流的碰撞性。激光诱导荧光被用来映射空间分辨的密度和速度分布函数的离子。我们将局部热平衡的缺乏和相互渗透、逆流离子的不同群体确定为动力学行为的特征。实验数据进行了比较，从一个一维，两种流体的数值模拟的结果。
英文摘要：
We create streaming ultracold neutral plasmas by tailoring the photoionizing laser beam that creates the plasma. By varying the electron temperature, we control the relative velocity of the streaming populations, and, in conjunction with variation of the plasma density, this controls the ion collisionality of the colliding streams. Laser-induced fluorescence is used to map the spatially resolved density and velocity distribution function for the ions. We identify the lack of local thermal equilibrium and distinct populations of interpenetrating, counter-streaming ions as signatures of kinetic behavior. Experimental data is compared with results from a one-dimensional, two-fluid numerical simulation.
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