Variation of the mean kinetic temperature of magnetically trapped atoms by external shaking perturbation

摘要

Using a shaking field overlaped to the static field of a quadrupole trap we have performed experiments with cold Na atoms held in a magnetic trap. As a function of the shaking fre quency the temperature of the atomic cloud is measured by time- of-flight. We observe results similar to Kumakura et al. [Phys. Rev, A 68,021401(R)] and the variations of the kinetic temper ature in our results are explained based on a model where we selectively affect different velocity classes.