磁阱中的非谐混合
Anharmonic mixing in a magnetic trap
摘要：
我们在实验上观察到磁囚禁亚稳氖原子云在处于非平衡态后的再平衡。利用数值模拟，我们表明，非谐混合，由于在磁阱中的原子的无碰撞动力学的平衡，是在这个平衡的主导过程。我们确定了它的时间依赖于陷阱参数和原子温度。此外，我们在模拟中观察到在陷阱频率比ω_r / ω_z = 3/2处，径向和轴向陷阱尺寸之间的共振能量交换。这种共振现象可以用一个简单的振子模型来解释。
英文摘要：
We have experimentally observed re-equilibration of a magnetically trapped cloud of metastable neon atoms after it was put in a non-equilibrium state. Using numerical simulations we show that anharmonic mixing, equilibration due to the collisionless dynamics of atoms in a magnetic trap, is the dominant process in this equilibration. We determine the dependence of its time on trap parameters and atom temperature. Furthermore we observe in the simulations a resonant energy exchange between the radial and axial trap dimensions at a ratio of trap frequencies ω_r / ω_z = 3/2. This resonance is explained by a simple oscillator model.
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