Modeling the Influence of Magnetic Field on the Parameters of Onboard Rubidium Atomic Clocks Shield

The paper presents the results of modeling the effect of an additional magnetizing field on the parameters of the shield of an onboard rubidium atomic clock. On a laboratory setup, under conditions of the effect of a rotating magnetic field on the clock, simulating the magnetic environment on satellite board, the dependences of the Allan deviation of the rubidium atomic clock frequency were obtained. The studies were carried out for different values of the magnetizing field oriented coaxially and perpendicularly to the optical axis of the clock. The parameters of the magnetizing field for the amplitude of the rotating magnetic field of 2.4 A/m, 4.8 A/m and 24 A/m, corresponding to high, medium and low orbits of satellites, were specified. Also, a numerical modeling of the magnetic field effect on the parameters of the atomic clock magnetic shield was performed, showing the efficiency of using the magnetizing field in low geomagnetic fields. Calculations of the shielding factor of a single-layer magnetic shield in the function of a magnetizing magnetic field are carried out and a close correspondence of this dependence to the dynamics of the longitudinal shielding coefficient measured in a model experiment with a two-layer magnetic shield of an atomic clock is noted.