Cesium Beam Tube Research Articles

Evaluation and Operation of Atomic Beam Tube Frequency Standards Using Time Domain Velocity Selection Modulation

Pulsed excitation of atomic and molecular beam devices with separated Ramsey-type interaction regions allows the observation of signals due to very narrow atomic velocity groups. The theoretical background of this method is discussed. Experimental operation of a near mono-velocity cesium beam tube is demonstrated. The velocity distribution of a commercial cesium beam tube is obtained using the pulse method. The normal Ramsey pattern of this beam tube is calculated from the velocity distribution and compared with the measured Ramsey pattern. The pulse method allows the direct determination of the cavity phase shift and of the second-order Doppler correction in beam devices. The pulse method thus shows promise for the evaluation of existing laboratory as well as commercial cesium beam tubes with respect to these effects.

The Design, Construction, and Performance of a Cesium-Beam Tube

A discussion of salient aspects of the design, construction, and performance of the National Research Council 2.1-meter cesium-beam frequency standard is presented. Emphasis is placed on the characteristics of the cesium (F = 4)↔(F = 3) σ transitions as they are affected by a range of microwave power and weak dc-magnetic C-field intensities. The technique of C-field determination based on excitation of the (4,-4)↔(4,-3) transition is described.

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 π and σ hyperfine energy transitions as a function of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">osc</sub> -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.