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arXiv 1306.1852cond-mat.quant-gasphysics.atom-ph
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连续加载阱中的西西弗斯冷却

Sisyphus cooling in a continuously loaded trap

Valentin V. Volchkov, Jahn Rührig, Tilman Pfau, Axel Griesmaier

摘要:

我们展示了连续的西西弗斯冷却结合连续加载机制,用于有效地减缓和积累原子从引导光束。虽然加载本身是基于一个单一的缓慢步骤,施加射频场迫使原子重复这一步骤多次,导致所谓的西西弗斯冷却。这种扩展允许有效的加载和冷却原子从广泛的初始光束条件。我们研究的相互作用的连续加载和同时西西弗斯冷却在不同的密度制度。在低密度通量的情况下,我们观察到9个数量级的相空间密度的相对增益。这使得所提出的计划的理想工具,达到碰撞密度,使蒸发冷却-尽管不利的初始条件。

英文摘要:

We demonstrate continuous Sisyphus cooling combined with a continuous loading mechanism used to efficiently slow down and accumulate atoms from a guided beam. While the loading itself is based on a single slowing step, applying a radio frequency field forces the atoms to repeat this step many times resulting in a so-called Sisyphus cooling. This extension allows efficient loading and cooling of atoms from a wide range of initial beam conditions. We study the interplay of the continuous loading and simultaneous Sisyphus cooling in different density regimes. In the case of a low density flux we observe a relative gain in phase-space density of nine orders of magnitude. This makes the presented scheme an ideal tool for reaching collisional densities enabling evaporative cooling - in spite of unfavourable initial conditions.

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