Local Composition and Topography of Nb3Sn Diffusion Coatings on Niobium

Conference · Tue Dec 01 04:00:00 EST 2015

OSTI ID:1968873

Pudasaini, U. ^[1]; Eremeev, G. ^[2]; Reece, Charles E. ^[2]; Kelley, M. J. ^[3]

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1. College of William and Mary, Williamsburg, VA (United States)
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
3. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The potential for energy savings and for increased gradient continues to bring attention to Nb3Sn-coated niobium as a future SRF cavity technology. We prepared these materials by vapor diffusion coating on polycrystalline and single crystal niobium. The effect of changing substrate preparation, coating parameters, and post-treatment was examined by AFM and SEM/EDS. The AFM data were analyzed in terms of power spectral density (PSD). We found little effect of pre-coating topography on the resulting surface roughness. The PSD curves from the coated samples show some surprising kinship to those obtained from BCP-treated surfaces. SEM/EDS revealed no compositional non-uniformities at the micron scale. Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1968873
• Report Number(s): JLAB-ACC-15-2163; DOE/OR/23177-3602
• Country of Publication: United States
• Language: English