Conveners
Nb/Cu Technology: Advanced Substrates
- Mingqi Ge (Cornell University)
It is known that any field requires Its own preparation protocol for a successful result. Same for particle accelerator industry, that are working in nuclear and high-energy physics research. It is important to have more and more efficient superconducting radio frequency (SRF) cavities, which performance is highly depended on substrate preparation. Niobium cavities became a standard choice for...
Copper, niobium thin film coated, superconducting radiofrequency (SRF) elliptical cavities have demonstrated for several applications a strong potential as an alternative to bulk niobium ones. The present manufacturing techniques include electron-beam welding in order to join the half-cells and the cut-offs together. The weld lines can carry geometrical defects and induce porosities, which can...
A degradation of the RF performance at high fields has been historically observed in SRF thin film coated cavities. It is known that the presence of defects in the superconducting thin film causes a local increase of the surface resistance, which is correlated to power being dissipated in the surroundings of the defect. This leads to the observed Q drop which becomes more important when...
