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EFFECT OF LOWER TEMPERATURE ANNEALING ON SURFACE PROPERTIES OF VAPOR DIFFUSION COATING OF Nb3Sn.

Sep 20, 2022, 11:00 AM
20m
CEBAF Center Auditorium

CEBAF Center Auditorium

Beyond Nb: Alternate materials and mulilayer structures Beyond Nb: Alternate materials and mulilayer structures

Speaker

Jayendrika Tiskumara (Old Dominion University)

Description

Nb3Sn is a next-generation material for the SRF accelerator cavities to replace Nb, which promises superior performance and higher operating temperature than Nb because of higher critical temperature and superheating field, both twice compared to Nb. Accordingly, it promises significant cost reduction. The Sn vapor diffusion method is the most preferred and successful technique to coat niobium cavities with Nb3Sn so far. Although several post-coating techniques (chemical, electrochemical, mechanical) have been explored to improve the surface quality of the coated surface, an effective process has yet to be found. Since there are only a few studies available, we annealed Nb3Sn-coated samples at 850 ℃ - 950 ℃ for different periods to study the effect of heat treatments on surface properties, primarily aimed at removing surface Sn residues. Selected annealing parameters were applied to a coated cavity to assess the effect on the RF performance. This presentation discusses the systematic surface studies using samples and the effect of annealing on the RF performance of a coated single-cell cavity

Primary authors

Jayendrika Tiskumara (Old Dominion University) Jean Delayen (JLAB) Uttar Pudasaini (Jefferson Lab) Grigory Eremeev (Fermilab)

Presentation materials