Abstract
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 π and σ hyperfine energy transitions as a function of Hosc-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.

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