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We investigate the effect of high temperature treatments followed by onlyhigh-pressure water rinse (HPR) of superconducting radio frequency (SRF)niobium cavities. The objective is to provide a cost effective alternative tothe typical cavity processing sequence, by eliminating the material removalstep post furnace treatment while preserving or improving the RF performance.The studies have been conducted in the temperature range 800-1000C fordifferent conditions of the starting substrate: large grain and fine grain,electro-polished (EP) and centrifugal barrel polished (CBP) to mirror finish.An interesting effect of the grain size on the performances is found. Cavityresults and samples characterization show that furnace contaminants cause poorcavity performance, and a practical solution is found to prevent surfacecontamination. Extraordinary values of residual resistances ~ 1 nOhm and beloware then consistently achieved for the contamination-free cavities. Theseresults lead to a more cost-effective processing and improved RF performance,and, in conjunction with CBP, open a potential pathway to acid-free processing.

Fermilab experience of post-annealing losses in SRF niobium cavities due  to furnace contamination and the ways to its mitigation: a pathway to  processing simplification and quality factor improvement