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.
@article{arxiv.1106.1812,
title = {A xenon gas purity monitor for EXO},
author = {EXO Collaboration and A. Dobi and C. Hall and S. Herrin and A. Odian and C. Y. Prescott and P. C. Rowson and N. Ackerman and B. Aharmin and M. Auger and P. S. Barbeau and K. Barry and C. Benitez-Medina and M. Breidenbach and S. Cook and I. Counts and T. Daniels and R. DeVoe and M. J. Dolinski and K. Donato and W. Fairbank and J. Farine and G. Giroux and R. Gornea and K. Graham and G. Gratta and M. Green and C. Hagemann and K. Hall and D. Hallman and C. Hargrove and A. Karelin and L. J. Kaufman and A. Kuchenkov and K. Kumar and J. Lacey and D. S. Leonard and F. LePort and D. Mackay and R. MacLellan and B. Mong and M. Montero Diez and A. R. Muller and R. Neilson and E. Niner and K. O'Sullivan and A. Piepke and A. Pocar and K. Pushkin and E. Rollin and D. Sinclair and S. Slutsky and V. Stekhanov and K. Twelker and N. Voskanian and J. -L. Vuilleumier and U. Wichoski and J. Wodin and L. Yang and Y. -R. Yen},
journal= {arXiv preprint arXiv:1106.1812},
year = {2015}
}