Foam copper adsorber facilitates the collimation of rubidium atomic beam

The collimation of continuous atomic beam, when utilized in precision metrology, emerges as a pivotal determinant of the measurement's accuracy. In this work, experimental study and theoretical simulation are combined to evaluate the collimating effect of a copper foam adsorber on thermal atomic beams. The experimental results show that the atoms' divergence angle decreases from 0.039 to 0.019 rad after being equipped with the adsorber. Meanwhile, Monte Carlo simulations were carried out to investigate the collimating effect on the sticking factor of the adsorber. Our work contributes novel perspectives to the development of atomic beam collimation apparatus.