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• W4220774099 abstract "Superconducting Radio-Frequency cavities are currently made out of niobium. Niobium cavities are limited by the magnetic field on the cavity walls due to the entry of vortices at the field of first vortex penetration, H[Formula: see text]. Low temperature baking in vacuum or low pressure gas atmosphere removes the strong decrease of the quality factor with accelerating gradient (high field Q-slope). Some cavities reach surface magnetic field above the lower critical field H[Formula: see text]. One hypothesis for this performance increase is that the outer layer affected by the treatments acts as a barrier for vortex penetration (effective bilayer). Using a vibrating sample magnetometer the field of first flux penetration (H[Formula: see text]) was measured for Nb ellipsoids with various low temperature treatments. All H[Formula: see text] values were found to be consistent with the lower critical field, H[Formula: see text], as predicted for clean niobium. This led to the conclusion that a metastable flux free state above H[Formula: see text] cannot be observed in DC magnetometry for low temperature baked niobium unlike for bilayers consisting of two superconductors as previously published. The effect of flux pinning differed significantly between treatments, suggesting that the high field Q-slope mitigation might be related to vortex pinning in the surface of the cavities." @default.
• W4220774099 created "2022-04-03" @default.
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• W4220774099 date "2022-04-01" @default.
• W4220774099 modified "2023-09-26" @default.
• W4220774099 title "No interface energy barrier and increased surface pinning in low temperature baked niobium" @default.
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• W4220774099 doi "https://doi.org/10.1038/s41598-022-09023-0" @default.
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