3 papers
cond-mat.supr-con2026
Electropolishing-Induced Topographic Defects in Niobium: Insights and Implications for Superconducting Radio Frequency Applications
Oleksandr Hryhorenko, Anne-Marie Valente-Feliciano, Eric M. Lechner
Electropolishing is the premier surface preparation method for high-Q, high-gradient superconducting RF cavities made of Nb. This leaves behind an apparently smooth surface, yet th…
cond-mat.supr-con2026
Niobium's intrinsic coherence length and penetration depth revisited using low-energy muon spin spectroscopy and secondary-ion mass spectrometry
Ryan M. L. McFadden, Jonathan W. Angle, Eric M. Lechner +7
We report direct, simultaneous measurements of the London penetration depth () and Bardeen-Cooper-Schrieffer (BCS) coherence length () in oxygen-doped niobium, with imp…
cond-mat.supr-con2024
Analysis of Thermal Grooving Effects on Vortex Penetration in Vapor-Diffused Nb3Sn
Eric M. Lechner, Olga Trofimova, Jonathan W. Angle +2
While Nb3Sn theoretically offers better superconducting RF cavity performance (Q0 and Eacc) to Nb at any given temperature, peak RF magnetic fields consistently fall short of the 4…