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Comparison of two multiplexed portable cold atom vacuum standards



Lucas Ehinger, Bishnu Acharya, Daniel Barker, James A. Fedchak, Julia Scherschligt, Eite Tiesinga, Stephen Eckel


We compare the vacuum measured by two portable cold atom vacuum standards (pCAVS) based on ultracold $^7$Li atoms. Our pCAVS devices share the same laser system and measure the vacuum concurrently. The two pCAVS together detected a leak with a rate on the order of $10^-6}$ Pa L/s. After fixing the leak, the pCAVS measured a pressure of about 40 nPa with 2.6 % uncertainty. The two pCAVS agree within their uncertainties, even when swapping some of their component parts. Operation of the pCAVS was found to cause some additional outgassing, on the order of $10^-8}$ Pa L/s, which can be mitigated in the future by better thermal management.
AVS Quantum Science


cold atom vacuum standard, UHV and XHV pressure sensors, leak detection


Ehinger, L. , Acharya, B. , Barker, D. , Fedchak, J. , Scherschligt, J. , Tiesinga, E. and Eckel, S. (2022), Comparison of two multiplexed portable cold atom vacuum standards, AVS Quantum Science, [online],, (Accessed June 19, 2024)


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Created July 15, 2022, Updated November 29, 2022