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|Title:||Gas and RRR distribution in high purity Niobium EB welded in ultra-high vacuum|
|Abstract:||Electron beam (EB) welding in UHV (ultra-high vacuum, 10 -5÷10 -8 mbar) is applied in the standard fabrication of high gradient niobium superconducting radio frequency (SRF) cavities of TESLA design. The quality of EB welding is critical for cavity performance. Experimental data of gas content (H 2, O 2, N 2) and RRR (residual resistivity ratio) measurements in niobium (Nb) welding seams are presented. EB welding in UHV conditions allow to preserve low gas content (1÷3 wt. ppm hydrogen and 5÷7 ppm oxygen and nitrogen), essential for high values of RRR - 350÷400 units. Gas content redistribution in the electron beam welded and heat affected region take place in the welding process. Correlation between gas solubility parameters, RRR and thermal conductivity are presented. Mechanisms of gas solubility in EB welding process are discussed. © 2006 American Institute of Physics.|
|Keywords:||ELECTRON BEAM WELDING|
RESIDUAL RESISTIVITY RATIO
|Conference name:||HYDROGEN IN MATTER: A Collection from the Papers Presented at the 2nd International Symposium on Hydrogen in Matter,ISOHIM|
|Conference date:||13 June 2005 through 17 June 2005|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS|
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