Superconducting 500 MHz accelerating copper cavities sputter-coated with niobium films
Conference
·
· IEEE Trans. Magn.; (United States)
OSTI ID:6484842
Thermal breakdown induced either by electron loading or by local defects of enhanced RF losses limits the accelerating field of superconducting niobium cavities. Replacing niobium with a material of higher thermal conductivity would be highly desirable to increase the maximum field. Therefore, cavities made of OFHC copper were coated by D.C. bias sputtering with a thin niobium film (1.5 to 5 ..mu..). Accelerating fields up to 8.6 MVm/sup -1/ were obtained without observing any field breakdown, the limitation being due to the available rf power. The Q values achieved at 4.2 K and low field were similar to those of niobium sheet cavities (i.e. about 2 x 10/sup 9/), but a fast initial decrease of Q to about 10/sup 9/ was reproducibly experienced. Subsequent inspection of regions of enhanced rf losses revealed defects the origin of which is under study. The apparatus used for coating the cavities and the results obtained are presented and discussed.
- Research Organization:
- CERN, Geneva
- OSTI ID:
- 6484842
- 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
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Wed Sep 16 00:00:00 EDT 2009
· Superconductor Science and Technology
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OSTI ID:1999570
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Sat Jul 01 00:00:00 EDT 2006
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OSTI ID:850150
PERFORMANCES OF HIGH PURITY NIOBIUM CAVITIES WITH DIFFERENT GRAIN SIZES
Conference
·
Mon Aug 21 00:00:00 EDT 2006
·
OSTI ID:895292
Related Subjects
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
CAVITY RESONATORS
COATINGS
COPPER
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEPOSITION
DIFFUSION COATING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ELEMENTS
ENERGY
EQUIPMENT
FILMS
FREQUENCY RANGE
LOSSES
METALS
MHZ RANGE
MHZ RANGE 100-1000
NIOBIUM
PHYSICAL PROPERTIES
PROTECTIVE COATINGS
Q-VALUE
RADIATIONS
RADIOWAVE RADIATION
RESONATORS
SPUTTERING
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
SURFACE COATING
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENTS
360101 -- Metals & Alloys-- Preparation & Fabrication
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
CAVITY RESONATORS
COATINGS
COPPER
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEPOSITION
DIFFUSION COATING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ELEMENTS
ENERGY
EQUIPMENT
FILMS
FREQUENCY RANGE
LOSSES
METALS
MHZ RANGE
MHZ RANGE 100-1000
NIOBIUM
PHYSICAL PROPERTIES
PROTECTIVE COATINGS
Q-VALUE
RADIATIONS
RADIOWAVE RADIATION
RESONATORS
SPUTTERING
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
SURFACE COATING
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENTS