Helium barrier atom chamber
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United States of America Patent
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Oct 1, 2013
Grant Date -
Oct 11, 2012
app pub date -
Apr 6, 2012
filing date -
Apr 7, 2011
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Abstract
The present invention discloses a vacuum chamber having operating pressures in the ultra-high vacuum (UHV) range (10−8 torr to 10−13 torr) and incorporating transparent windows, said windows constructed from transparent materials (preferably glass), and having low helium permeability velocity under operating and storage conditions. Embodiments may also contain surface coatings on windows to reduce helium permeation. Also disclosed herein is a method for vacuum processing said chamber by heating entire chamber and exposing the inside and outside of the chamber windows to helium free environments. Methods for final sealing said chamber are also discussed. The vacuum chamber is useful as a container for optically-cooled atoms for use in quantum information and atomic clocks and as a sensor for magnetic fields, gravitational fields, and inertial effects.
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