A new purification technique for improving the thermal conductivity of superconducting Nb microwave cavities

Improvement factors up to 4 in the thermal conductivity of Niobium between 4 and 9K are obtainted by a new purification technique which removes the dominant interstitial impurity (oxygen) found in commercial Nb. In the process, surfaces of the cavity are brought into proximity with Yttrium foil at -...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1985-03, Vol.21 (2), p.1007-1010
Main Author: Padamsee, H.
Format: Article
Language:English
Subjects:
Electric breakdown
Impurities
Microwave theory and techniques
Niobium
Purification
Rapid thermal processing
Superconducting microwave devices
Thermal conductivity
Thermal factors
Yttrium
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Summary:Improvement factors up to 4 in the thermal conductivity of Niobium between 4 and 9K are obtainted by a new purification technique which removes the dominant interstitial impurity (oxygen) found in commercial Nb. In the process, surfaces of the cavity are brought into proximity with Yttrium foil at -10 -5 torr for several hours. A vapor deposited film of several μm thickness traps oxygen diffusing rapidly from the bulk to the surface. A single cell, 1500 MHz, elliptically shaped cavity with thermal conductivity improved by this method shows amelioration of thermal breakdown, as predicted by thermal model calculations.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.1985.1063666