Proceedings of the 21st International Conference on RF Superconductivity
21st International Conference on RF Superconductivity, June 25-30, 2023, Grand Rapids, Michigan
Recent advancement in superconducting radio frequency cavity processing techniques, with diffusion of impurities within the RF penetration depth, resulted in high quality factor with increase in quality factor with increasing accelerating gradient. The increase in quality factor is the result of a decrease in the surface resistance as a result of nonmagnetic impurities doping and change in electronic density of states. The fundamental understanding of the dependence of surface resistance on frequency and surface preparation is still an active area of research. Here, we present the result of RF measurements of the TEM modes in a coaxial half-wave niobium cavity resonating at frequencies between 0.3 - 1.3 GHz. The temperature dependence of the surface resistance was measured between 4.2 K and 1.6 K. The field dependence of the surface resistance was measured at 2.0 K. The baseline measurements were made after standard surface preparation by buffered chemical polishing.
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Original Publication Citation
Raut, N. K., Ciovati, G., De Silva, S. U., Delayen, J. R., Dhakal, P., Khanal, B. D., & Tiskumara, J. K. (2023). Temperature, RF field, and frequency dependence performance evaluation of superconducting niobium half-wave coaxial cavity. In K. Saito, T. Xu, N. Sakamoto, V. R. W. Schaa, & P. Thomas (Eds.), Proceedings of the 21st International Conference on RF Superconductivity (pp. 686-690). JACoW. https://srf2023.vrws.de/papers/wepwb052.pdf
0000-0002-4809-9439 (De Silva)
Raut, N. K.; Ciovati, G.; De Silva, S. U.; Delayen, J. R.; Dhakal, P.; Khanal, B. D.; and Tiskumara, J. K., "Temperature, RF Field, and Frequency Dependence Performance Evaluation of Superconducting Niobium Half-Wave Coaxial Cavity" (2023). Physics Faculty Publications. 815.