A xenon gas purity monitor for EXO
EXO Collaboration: A. Dobi, C. Hall, S. Herrin, A. Odian, C.Y., Prescott, P.C. Rowson, N. Ackerman, B. Aharmin, M. Auger, P.S. Barbeau, K., Barry, C. Benitez-Medina, M. Breidenbach, S. Cook, I. Counts, T. Daniels, R., DeVoe, M.J. Dolinski, K. Donato, W. Fairbank Jr., J. Farine
TL;DR
This paper presents the design, calibration, and operation of xenon gas purity monitors for the EXO double beta decay experiment, capable of detecting oxygen impurities below 1 ppb at atmospheric pressure.
Contribution
It introduces two versions of a xenon gas purity monitor, detailing their theory, calibration, and application in the EXO experiment, with potential use in other noble gases.
Findings
Monitors are sensitive to oxygen below 1 ppb.
Devices successfully used in the EXO-200 experiment.
Theoretical and practical aspects of GPM operation are discussed.
Abstract
We discuss the design, operation, and calibration of two versions of a xenon gas purity monitor (GPM) developed for the EXO double beta decay program. The devices are sensitive to concentrations of oxygen well below 1 ppb at an ambient gas pressure of one atmosphere or more. The theory of operation of the GPM is discussed along with the interactions of oxygen and other impurities with the GPM's tungsten filament. Lab tests and experiences in commissioning the EXO-200 double beta decay experiment are described. These devices can also be used on other noble gases.
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