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We present the results of from DC magnetization and penetration depthmeasurements of cylindrical bulk large-grain (LG) and fine-grain (FG) niobiumsamples used for the fabrication of superconducting radio frequency (SRF)cavities. The surface treatment consisted of electropolishing and lowtemperature baking as they are typically applied to SRF cavities. Themagnetization data were fitted using a modified critical state model. Thecritical current density Jc and pinning force Fp are calculated from themagnetization data and their temperature dependence and field dependence arepresented. The LG samples have lower critical current density and pinning forcedensity compared to FG samples which implies a lower flux trapping efficiency.This effect may explain the lower values of residual resistance often observedin LG cavities than FG cavities.

Flux pinning characteristics in cylindrical ingot niobium used in superconducting radio frequency cavity fabrication