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

Conference · Fri Mar 01 04:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6341002

Padamsee, H

Improvement factors up to 4 in the thermal conductivity of Niobium between 4 and 9K are obtained 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 about10/sup -5/ torr for several hours. A vapor deposited film of several ..mu..m 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.

• Research Organization: Laboratory of Nuclear Studies, Newman Laboratory, Cornell University, Ithaca, NY
• OSTI ID: 6341002
• Report Number(s): CONF-840937-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG 21:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CAVITY RESONATORS
CHEMICAL REACTIONS
COATINGS
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FOILS
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
MICROWAVE RADIATION
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
PURIFICATION
RADIATIONS
REDUCTION
RESONATORS
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SURFACE PROPERTIES
THERMAL CONDUCTIVITY
THERMAL DEGRADATION
THERMODYNAMIC PROPERTIES
VAPOR DEPOSITED COATINGS
YTTRIUM ALLOYS