Nb/sub 3/Sn coating of high purity Nb cavities
Conference
·
· IEEE Trans. Magn.; (United States)
OSTI ID:6091088
Superconducting Nb cavities fabricated from high purity sheet material or postpurified by solid state gettering with Y or Ti provide high field and Q/sub 0/ levels due to the thermal stabilization of defects. For accelerator applications especially at frequencies above 1 GHz the coating of such cavities with Nb/sub 3/Sn layers is challenging because of significantly reduced rf losses at operating temperatures of about 4.2 K. The authors have developed a modified vapor diffusion technique using specially constructed UHV furnaces to produce uniform Nb/sub 3/Sn layers on 1 and 3 GHz accelerator cavities without losing the high thermal conductivity of the Nb wall. In a first experiment with a single-cell 3 GHz cavity of medium Nb purity (RRR=156) the authors have achieved E/sub acc/=10 MV/m with an 0.6 ..mu..m thick Nb/sub 3/Sn layer. This is so far the highest accelerating field for our Nb/sub 3/Sn cavities but it is low compared to the 25 MV/m achieved in the same cavity before coating. Possible reasons for the reduced breakdown field for Nb/sub 3/Sn will be discussed on the basis of the local thermal breakdown model.
- Research Organization:
- 6996600
- OSTI ID:
- 6091088
- Report Number(s):
- CONF-880812-
- Conference Information:
- Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
ALLOYS
CAVITY RESONATORS
COATINGS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
GETTERING
MATHEMATICAL MODELS
METALS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
PARTICLE MODELS
PHYSICAL PROPERTIES
PLASMA
PROTECTIVE COATINGS
RESONATORS
SOLID-STATE PLASMA
STABILIZATION
STATISTICAL MODELS
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
THERMAL CONDUCTIVITY
THERMAL CYCLING
THERMODYNAMIC MODEL
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TITANIUM
TRANSITION ELEMENTS
YTTRIUM
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
ALLOYS
CAVITY RESONATORS
COATINGS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
GETTERING
MATHEMATICAL MODELS
METALS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
PARTICLE MODELS
PHYSICAL PROPERTIES
PLASMA
PROTECTIVE COATINGS
RESONATORS
SOLID-STATE PLASMA
STABILIZATION
STATISTICAL MODELS
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
THERMAL CONDUCTIVITY
THERMAL CYCLING
THERMODYNAMIC MODEL
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TITANIUM
TRANSITION ELEMENTS
YTTRIUM