Measuring and testing – Gas analysis
Reexamination Certificate
2008-03-11
2008-03-11
Larkin, Daniel S. (Department: 2856)
Measuring and testing
Gas analysis
Reexamination Certificate
active
11270714
ABSTRACT:
A method for determining the mobility of hydrogen as a function of temperature in superconducting niobium cavities comprising: 1) heating a cavity under test to remove free hydrogen; 2) introducing hydrogen-3 gas into the cavity; 3) cooling the cavity to allow absorption of hydrogen-3; and 4) measuring the amount of hydrogen-3 by: a) cooling the cavity to about 4° K while flowing a known and regulated amount of inert carrier gas such as argon or helium into the cavity; b) allowing the cavity to warm at a stable rate from 4° K to room temperature as it leaves the chamber; and c) directing the exit gas to an ion chamber radiation detector.
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Knobloch, J., “The “Q-Disease” in Superconducting Niobium RF Cavities”, Hydrogen in Materials and Vacuum Systems, First International Workshop on Hydrogen in Materials and Vacuum Systems, AIP Conference Proceedings, vol. 671, 2003, pp. 133-150.
Jefferson Science Associates LLC
Larkin Daniel S.
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