Vibro-tumbling as an alternative to standard mechanical polishing techniques for srf cavities

Centrifugal Barrel Polishing (CBP) is a common tool in the Nb bulk SC cavities production, prior to electropolishing (EP). Indeed, the mechanical polishing is fundamental also in the superconducting thin film resonant cavities in which one of the main issues that limits the performances is the surface preparation [1]. A promising vibro- tumbling technique is being studied and implemented with a possibility to replace or improve mechanical treatment steps (grinding, barrel polishing) [2, 3]. The simplicity of the technology allows it to adapt to any cavity geometry, both for Nb and Cu materials. The presented work contains last results on 6 GHz cavities obtained at LNLINFN, both Nb bulk and Cu cavities