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TY - CONF
AU - Pudasaini, U.
AU - Ciovati, G.
AU - Eremeev, G.V.
AU - Kelley, M.J.
AU - Parajuli, I.P.
AU - Reece, C.E.
AU - Sayeed, Md.N.
ED - Michel, Peter
ED - Arnold, André
ED - Schaa, Volker RW
TI - Recent Results From Nb₃Sn Single Cell Cavities Coated at Jefferson Lab
J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019
CY - Dresden, Germany
T2 - International Conference on RF Superconductivity
T3 - 19
LA - english
AB - Because of superior superconducting properties (Tc ~ 18.3K, Hs h ~ 425 mT and delta ~ 3.1 meV) compared to niobium, Nb₃Sn promise better RF performance (Q₀ and E_{acc}) and/or higher operating temperature (2 K Vs 4.2 K) for SRF cavities. Nb₃Sn-coated SRF cavities are produced routinely by depositing a few micron-thick Nb₃Sn films on the interior surface of Nb cavities via tin vapor diffusion technique. Early results from Nb₃Sn cavities coated with this technique exhibited precipi-tous low field Q-slope, also known as Wuppertal slope. Several Nb₃Sn single cell cavities coated at JLab ap-peared to exhibit similar Q-slope. RF testing of cavi-ties and materials study of witness samples were con-tinuously used to modify the coating protocol. At best condition, we were able to produce Nb₃Sn cavity with Q₀ in excess of ~ 5×10¹⁰ at 2 K and ~ 2×1010 at 4 K up the accelerating gradient of ~15 MV/m, without any significant Q-slope. In this presentation, we will dis-cuss recent results from several Nb₃Sn coated single-cell cavities linked with material studies of witness samples, coating process modifications and the possi-ble causative factors to Wuppertal slope.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 65
EP - 70
KW - cavity
KW - SRF
KW - experiment
KW - factory
KW - niobium
DA - 2019/08
PY - 2019
SN - ""
SN - 978-3-95450-211-0
DO - doi:10.18429/JACoW-SRF2019-MOP018
UR - http://jacow.org/srf2019/papers/mop018.pdf
ER -