rf-induced Sisyphus cooling in a magnetic trap

Abstract

We show an rf-induced Sisyphus cooling process for magnetic traps that may easily be applied to many of the current Bose-Einstein condensation experiments. Through Monte Carlo simulations of magnetically trapped $^{87}\mathrm{Rb}$ we have shown a cooling rate of $\ensuremath{\sim}15\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}∕\mathrm{s}$. We have also shown a greater efficiency than evaporative cooling from $250\ensuremath{\rightarrow}\ensuremath{\sim}7\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$ with an efficiency $\ensuremath{\alpha}=d\phantom{\rule{0.2em}{0ex}}\mathrm{ln}\phantom{\rule{0.2em}{0ex}}T∕d\phantom{\rule{0.2em}{0ex}}\mathrm{ln}\phantom{\rule{0.2em}{0ex}}N>3$ over the majority of this range.