Foam copper adsorber facilitates the collimation of rubidium atomic beam.

This article focuses on the experimental and theoretical evaluation of a copper foam adsorber's effect on the collimation of continuous rubidium (Rb) atomic beams used in precision metrology. The study demonstrates that installing the copper foam adsorber reduces the atomic beam's divergence angle from 0.039 to 0.019 radians, effectively improving beam collimation while decreasing atomic flux by about 60%. Monte Carlo simulations using the MoFlow+ simulator support these findings by showing that the adsorber preferentially captures atoms with large divergence angles, enhancing beam purity at the cost of some intensity. The research also investigates the adsorber's operational lifespan, attributing performance degradation after approximately 300–400 hours to saturation of adsorption sites, and suggests that parameters such as foam porosity and temperature can be optimized to extend adsorber effectiveness.