A Linear RFQ Ion Trap for the Enriched Xenon Observatory

The design, construction, and performance of a linear radio-frequency ion trap(RFQ) intended for use in the Enriched Xenon Observatory(EXO) are described. EXO aims to detect the neutrinoless double-beta decayof {sup 136}Xe to {sup 136}Ba. To suppress possible backgrounds EXO will complement the measurement of decay energyand, to some extent, topology of candidate events in a Xe filled detector with the identification of the daughter nucleus ({sup 136}Ba). The ion trapdescribed here is capable of accepting, cooling, and confining individual Ba ions extracted from the site of the candidate double-beta decayevent. A single trapped ion can then be identified, with a large signal-to-noise ratio, via laser spectroscopy.