Preliminary analysis of the flow field in a transparent model of a SRF cavity by PIV

Niobium superconductive radio frequency cavities (SRF cavities) are commonly employed in linear accelerator; very pure, clean, and smooth internal walls required to make the cavity working properly with a high Q factor. Typically, achieve suitable surface quality SRF subjected treatment called Buffered Chemical Polish (BCP), latter uses strong concentrated acids mixture flowing through chemically etch thin niobium layer (∼250 μm). A viable way understand optimize BCP process is by using computational fluid dynamic (CFD); however, experimental validation of numerical physical models confidently use CFD results. The aim our work investigate dynamics Particle Image Velocimetry (PIV) refractive index matching (RIM) techniques, provide data validate simulations. paper describes briefly analyse setup preliminary results achieved so far.