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DOE OSTI · 1644041

Nb 3 Sn multicell cavity coating system at Jefferson Lab

Eremeev, G.·Clemens, W.·Macha, K.·Reece, C. E.·Valente-Feliciano, A. M.·Williams, S.·Pudasaini, U.·Kelley, M.
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Abstract

Superconducting radio frequency niobium cavities are the building blocks of modern accelerators for scientific applications. Lower surface resistance, higher fields, and high operating temperatures advance the reach of the future accelerators for scientific discovery as well as potentially enabling cost-effective industrial solutions. We describe the design and performance of an Nb 3 Sn coating system that converts the inner surface of niobium cavities to an Nb 3 Sn film. The niobium surface, heated by radiation from the niobium retort, is exposed to Sn and SnCl 2 vapor during the heat cycle, which results in about 2 μm Nb 3 Sn film on the niobium surface. Film composition and structure as well as radio frequency properties with 1-cell R&D cavities and 5-cell practical accelerator cavities are presented.

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47 OTHER INSTRUMENTATIONVacuum apparatusdepositionmechanical instrumentsparticle acceleratorsradiofrequency cavitiessuperconductorsthermodynamic states and processesthin films

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Eremeev, G., Clemens, W., Macha, K., Reece, C. E., Valente-Feliciano, A. M., Williams, S., Pudasaini, U., Kelley, M.. 2020-07-27. Nb 3 Sn multicell cavity coating system at Jefferson Lab. https://doi.org/10.1063/1.5144490

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