Enhancing the Signal-to-Noise Ratio in Optically Pumped Cesium Beam Tubes Using a Hexapole Magnetic System

In order to improve the currently limited Signal-to-Noise Ratio (SNR) of the compact optically pumped cesium beam tubes, we proposed a hexapole magnetic focusing method for the cesium beams. The total number of the detected cesium atoms with a hexapole magnetic system were calculated and found to be 9.5 times higher than that without the hexapole magnetic system. This result gives a prediction of 3.1 fold increase in the SNR when only the shot noise is considered, compared with the conventional tubes. In order to be closely integrated with experimental verification, the hexapole magnetic system was engineered and the simulation results of this structure shown that it not only met the magnetic induction requirements of the simulation under multiple channels, but also had effective magnetic shielding.