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Most of the current research in superconducting radio frequency (SRF)cavities is focused on ways to reduce the construction and operating cost ofSRF based accelerators as well as on the development of new or improved cavityprocessing techniques. The increase in quality factors is the result of thereduction of the surface resistance of the materials. A recent test on a 1.5GHz single cell cavity made from ingot niobium of medium purity and heattreated at 1400 C in a ultra-high vacuum induction furnace resulted in aresidual resistance of about 1nanoohm and a quality factor at 2.0 K increasingwith field up to 5x10^10 at a peak magnetic field of 90 mT. In thiscontribution, we present some results on the investigation of the origin of theextended Q0-increase, obtained by multiple HF rinses, oxypolishing and heattreatment of all Nb cavities.

Analysis of post wet chemistry heat treatment effects on Nb SRF surface resistance