We report on the confinement of a Bose–Einstein condensate in an annular trap with widely tunable parameters. The trap relies on a combination of magnetic, optical and radio-frequency fields. The loading procedure is discussed. We present annular traps with radii adjusted between 20 and 150 μm. We demonstrate the preparation of persistent flows both with a rotating laser stirrer and with a global quadrupole deformation of the ring. Our setup is well adapted for the study of superfluid dynamics.

中文翻译：

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用于量子气体的多功能环形陷阱

我们报告了 Bose-Einstein 凝聚体在具有广泛可调参数的环形阱中的限制。陷阱依赖于磁场、光学和射频场的组合。讨论了加载过程。我们提出了半径在 20 到 150 μm之间调整的环形陷阱。我们展示了使用旋转激光搅拌器和环的全局四极变形制备持续流动。我们的设置非常适合超流体动力学的研究。