JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF
AU - Pudasaini, U.
AU - Kelley, M.J.
AU - Lechner, E.M.
AU - Reece, C.E.
AU - Trofimova, O.
AU - Valente-Feliciano, A-M.
ED - Saito, Kenji
ED - Xu, Ting
ED - Sakamoto, Naruhiko
ED - Schaa, Volker R.W.
ED - Thomas, Paul W.
TI - Surface Roughness Reduction and Performance of Vapor-Diffusion Coating of Nb₃Sn Film for SRF Application
J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY - Grand Rapids, MI, USA
T2 - International Conference on RF Superconductivity
T3 - 21
LA - english
AB - Nb₃Sn offers the prospect of better RF performance (Q and E_{acc}) than niobium at any given temperature because of its superior superconducting properties. Nb₃Sn-coated SRF cavities are routinely produced by growing a few microns thick Nb₃Sn film on Nb cavities via tin vapor diffusion. It has been observed that a clean and smooth surface can enhance the performance of the Nb₃Sn-coated cavity, typically, the attainable acceleration gradient. The reduction of surface roughness is often linked with a correlative reduction in average coating thickness and grain size. Besides Sn supply’s careful tuning, the temperature profiles were varied to reduce the surface roughness as low as ~40 nm in 20 µm × 20 µm AFM scans, one-third that of the typical coating. Samples were systematically coated inside a mock single-cell cavity and examined using different material characterization techniques. A few sets of coating parameters were used to coat 1.3 GHz single-cell cavities to understand the effects of roughness variation on the RF performance. This presentation will discuss ways to reduce surface roughness with results from a systematic analysis of the samples and Nb₃Sn-coated single-cell cavities.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 593
EP - 599
KW - cavity
KW - SRF
KW - site
KW - accelerating-gradient
KW - factory
DA - 2023/09
PY - 2023
SN - 2673-5504
SN - 978-3-95450-234-9
DO - doi:10.18429/JACoW-SRF2023-WEIAA03
UR - https://jacow.org/srf2023/papers/weiaa03.pdf
ER -