Recent Advances in Cesium Beam Technology and Characteristics of Rabi and Ramsey Cesium Beam Tubes 17 Inches Long

The design characteristics for both Rabi and Ramsey microwave structure cesium beam tubes 17 inches long are presented. A discussion on the effects of the orientation of the oscillaing magnetic component of the microwave field with respect to the steady dc weak magnetic C field is given. Energy state spectra of both ¿ and ¿ hyperfine energy transitions as a function of H^osc-Hc orientation and excitation microwave input power are shown. The frequency stability of the Ramsey structure 17-inch cesium beam tube operated in an NC-2001 electronics system for a 24-hour periozd is presented.