Conveners
M2Po3C - Nb-Based Superconductors
- Karl Hartwig
- Zu hawn Sung
Residual trapped magnetic flux suppresses the quality factor of SRF Nb cavities and thus microstructural features that can trap flux are of particular interest for developing higher performance cavities. We have been investigating tools to help quantify the microstructure of Nb to make it easier to compare microstructures resulting from different cavity processing routes. EBSD mapping is the...
A well-known source of RF losses that lower the performance of superconducting radio frequency cavities is due to the residual magnetic flux trapped during cool-down. In this presentation, we demonstrate how manipulating the niobium microstructure by changing the strain state of the initial Nb sheet for an elliptical cavity geometry, can improve the flux expulsion behavior. In this study we...
High cryogenic efficiency, measured as the quality factor (Q$_0$, 2K), has been made possible in Nb superconducting radio frequency (SRF) cavities due to advances in understanding the sub-surface micro-chemistry and structure developed in cavity processing. Recent experiments in SRF cavities have demonstrated the role of bulk cavity microstructure and its influence on trapped residual magnetic...
The Electron-Ion Collider (EIC) is a proposed machine to explore the behavior of the fundamental particles and forces that bind atomic nuclei together. The design and construction of the EIC are underway at Brookhaven National Laboratory (BNL) in collaboration with Thomas Jefferson National Accelerator Facility. EIC will use several different types of superconducting strands for magnets near...
