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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/22661623
Record Status
Checked
Record Id
22661623
Title
Superconducting coatings synthesized by CVD/PECVD for SRF cavities
Contributors
P Pizzol (STFC Daresbury Lab., and Liverpool Univ.)
,
P Chalker (Liverpool Univ.)
,
T Heil (Liverpool Univ.)
,
AN Hannah (STFC Daresbury Lab.)
,
OB Malyshev (STFC Daresbury Lab.)
,
SM Pattalwar (STFC Daresbury Lab.)
,
R Valizadeh (STFC Daresbury Lab.)
,
GBG Stenning (STFC Rutherford Appleton Lab.)
Abstract
Bulk niobium cavities are widely employed in particle accelerators to create high accelerating gradient despite their high material and operation cost. In order to reduce this cost, thin layer of niobium are deposited on a copper cavity, which has lower material cost with higher availability and more importantly higher thermal conductivity. The coating of superconducting cavities currently is synthesized by physical vapour deposition (PVD) method which suffers from lack of conformity. By using chemical vapour deposition (CVD) and plasma enhanced chemical vapour deposition (PECVD) it is possible to deposit thin Nb layers uniformly with density very close to bulk material. This project explores the use of PECVD / CVD techniques to deposit metallic niobium on copper using NbCl5 as precursor and hydrogen as a coreagent. The samples obtained were then characterized via SEM, TEM, SAD, XRD, XPS, and EDX as well as assessing their superconductivity characteristics (RRR and Tc) All the samples deposited are superconductive and polycrystalline; the sample obtained with CVD measured RRR=31 and Tc=7.9 K, while the sample obtained with PECVD exhibited RRR=9 and Tc= 9.4 K. In both cases the films grew in a (100) preferred orientation.
Organisation
ISIS
,
ASTeC
,
STFC
,
ISIS-MAT-CHAR-LAB
Keywords
Funding Information
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Language
English (EN)
Type
Details
URI(s)
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Year
Paper In Conference Proceedings
In 6th International Particle Accelerator Conference (IPAC'2015), Richmond, Virginia, USA, 3-8 May, 2015, (2015): 3246-3248.
http://accelconf.…/papers/wepha058.pdf
2015
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