Tuesday, June 11, 2013

1306.1852 (Valentin V. Volchkov et al.)

Sisyphus cooling in a continuously loaded trap    [PDF]

Valentin V. Volchkov, Jahn Rührig, Tilman Pfau, Axel Griesmaier
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.
View original: http://arxiv.org/abs/1306.1852

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