Hydrofluoridric chemistry, hot chemistries, plasma discharge, different kinds of baking, etc… several surface treatments modify the Q0(Eacc) profile of bulk niobium cavities. The analysis of these modifications allows a critical comparison with theoretical predictions. Furthermore, given the high field Q-slope improvement by baking and its insensitivity to an additional hydrofluoridric chemistry, the diffusion process cannot be only considered as a consequence of the thermal process. In this perspective some additional experiments are undertaken at Saclay where an “integrated baking system” will soon be built. |
