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Quasi-Adiabatic External State Preparation of Ultracold Atoms in Microgravity
Microgravity Science and Technology ( IF 1.8 ) Pub Date : 2020-10-21 , DOI: 10.1007/s12217-020-09840-w
A. R. Pollard , E. R. Moan , C. A. Sackett , E. R. Elliott , R. J. Thompson

The Cold Atom Laboratory on the International Space Station produces ultracold gases of rubidium and potassium in a tight magnetic trap near the surface of a magnetic chip. In order to use these samples in long-duration field-free experiments, the atoms must be moved away from the chip, expanded to larger volume, and released from the trap. We describe how these goals can be achieved using quasi-adiabatic techniques. For rubidium atoms, we demonstrate a displacement of 0.6 mm and expansion into a trap with a mean oscillation frequency of 6.4 Hz. The center-of-mass release velocity and the condensate expansion velocity are about 0.2 mm/s each. An unexpectedly large background magnetic field gradient is observed, which limits the usable interaction time for the released atoms.



中文翻译:

微重力超冷原子的拟绝热外态制备

国际空间站上的冷原子实验室在磁性芯片表面附近的紧密磁阱中产生ultra和钾的超冷气体。为了在长时间的无场实验中使用这些样品,必须将原子从芯片上移开,扩大到更大的体积,然后从陷阱中释放出来。我们描述了如何使用准绝热技术实现这些目标。对于rub原子,我们证明了0.6 mm的位移并扩展为陷阱,平均振荡频率为6.4 Hz。质心释放速度和冷凝物膨胀速度分别为约0.2mm / s。观察到意外大的背景磁场梯度,这限制了释放原子的可用相互作用时间。

更新日期:2020-10-30
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