Feasibility of end to end phase shift correction from the outside of sealed cesium beam tubes (frequency standard)

Summary from only given. Frequency shift traceable to asymmetry of the microwave resonator occurring in atomic beam frequency standards making use of Ramsey´s double interaction technique was addressed. The shift is due to the phase difference that appears between the fields interacting with the atoms in the two regions. Correcting the arm asymmetry by introducing a compensating asymmetry in the symmetric arm of the feeding T-junction was proposed. Electromagnetic calculations of the asymmetry introduced in an E-plane waveguide T-junction by an asymmetric iris in the feeding port were carried out and compared with experimental results. It was found that compensation of end-to-end phase shift is possible in this way, and that shifts of a few parts in 10/sup 13/ can be reduced to below 1*10/sup -13/.<>