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We present results on the effects of interstitial oxygen and carbon on abulk-niobium superconducting radio-frequency cavity. Previous experiments haveshown that high-temperature (~800 $^\circ\text{C}$) nitrogen-doping plays thedominant role in the reduction of the electron mean free path in the RFpenetration layer of niobium that leads to a decrease in microwave surfaceresistance and a suppression the temperature-dependent component of the surfaceresistance with increasing accelerating gradient. In this work, we show thatoxygen and carbon-doping has very similar effects on cavity performance,demonstrating that these effects are not unique to nitrogen. The preparationmethod used in the introduction of interstitial oxygen and carbon has theadvantage that it is done at lower temperatures than that of high-temperaturenitrogen-doping and does not require post-treatment electro-polishing.

Effects of Interstitial Oxygen and Carbon on Niobium Superconducting Cavities