Fine-Structure Artifact of the Velocity Distribution of Cs Beam Tubes as Measured by the Pulsed Microwave Power Technique.

摘要

An artifact of the pulsed microwave power technique used to measure the velocity distributions of Cs beam tubes is a fine structure on the distribution. In previously reported measurements the signal-to-noise ratio was not high enough to show this structure clearly. This paper presents results that show this structure in detail. To predict these results, a simple theory has been used that considers the Ramsey response function (i.e., output tube current vs microwave frequency) as being a simple electrical-filter transfer function for the input of the pulse-modulated microwave power. Calculations that assume the principle of superposition give predictions that are in close agreement with the measured results. This theory also predicts how to set the pulse width so that the fine-structure artifact is minimized.