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In this study we will show a new method of polishing for Nb3Sn cavities knownas centrifugal barrel polishing (CBP). Using this method, Nb3Sn coated samplesare polished to a surface roughness comparable to a traditional Nb cavity afterelectropolishing (EP). We also investigate different methods of cleaning theNb3Sn surface after CBP to remove residual abrasive particles. The polishedNb3Sn surface is analyzed using confocal laser microscopy, and scanningelectron microscopy (SEM) is used to image the surface and measure the surfaceroughness after polishing. Transmission electron microscopy (TEM) is also usedfor high resolution analysis of the surface after polishing. Finally, we showthat centrifugal barrel polishing can improve the performance of a Nb3Sn SRFcavity.

Improving Nb3Sn Cavity Performance Using Centrifugal Barrel Polishing