Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion

Conference · Mon Jun 01 04:00:00 EDT 2015 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/TASC.2014.2359640· OSTI ID:1187843

Dhakal, Pashupati ^[1]; Ciovati, Gianluigi ^[1]; Kneisel, Peter K. ^[1]; Myneni, Ganapati Rao ^[1]

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1. JLAB

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.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1187843
• Report Number(s): JLAB-ACC-14-1941; DOE/OR/23177-3162; arXiv:1408.6245
• Conference Information: Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 3 Journal Volume: 25
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY