Temperature, rf field, and frequency dependence performance evaluation of superconducting niobium half-wave coaxial cavity
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Old Dominion Univ., Norfolk, VA (United States)
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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 2202656
- Report Number(s):
- JLAB-ACC-23-3867; DOE/OR/23177-6510
- Resource Relation:
- Conference: SRF2023 (21st International Conference on Radio-Frequency Superconductivity), Grand Rapids, MI, USA, June 25, 2023
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of local losses as a function of material removal in a large-grain superconducting niobium cavity
Measurement of the high-field Q-drop in a high-purity large-grain niobium cavity for different oxidation processes