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Title: Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion

An increase in the quality factor of superconducting radiofrequency cavities is achieved by minimizing the surface resistance during processing steps. The surface resistance is the sum of temperature independent residual resistance and temperature/material dependent Bardeen-Cooper-Schrieffer (BCS) resistance. High temperature heat treatment usually reduces the impurities concentration from the bulk niobium, lowering the residual resistance. The BCS part can be reduced by selectively doping non-magnetic impurities. The increase in quality factor, termed as Q-rise, was observed in cavities when titanium or nitrogen thermally diffused in the inner cavity surface.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. JLAB
Publication Date:
OSTI Identifier:
1187843
Report Number(s):
JLAB-ACC-14-1941; DOE/OR/23177-3162; arXiv:1408.6245
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Journal Name: IEEE Transactions on Applied Superconductivity; Journal Volume: 25; Journal Issue: 3; Conference: ASC 2014 (Applied Superconductivity Conference), Charlotte, NC, USA, August 10-15, 2014
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE