Conveners
Nb thin film technology: 1
- Anne-Marie Valente-Feliciano (Jefferson Lab)
Nb thin film technology: 2
- Anne-Marie Valente-Feliciano (Jefferson Lab)
Nb/Cu coated SRF cavities present several advantages with respect to bulk Nb cavities. However, a systematic degradation of the performance at high accelerating gradients is observed.
At CERN, a vast R&D program has been conceived to find an optimized recipe for manufacturing Nb/Cu coated cavities, from the production and treatments of the copper substrates to the thin film deposition. In...
The time evolution of the positive ion energy distribution functions (IEDF's) at the substrate position in an asymmetric bipolar high-power impulse magnetron (HiPIMS) system was determined using a gridded energy analyser. This was done for a range of operating conditions, namely the positive voltage Urev and “on-time” negative pulse duration neg. The magnetron sputtering discharge was...
This paper summarizes of SRF thin film coating facilities set-up and progress at the Institute of High Energy Physics (IHEP), and presents preliminary results of 1.3 GHz 1-cell cavities coated with Nb, Nb3Sn, etc. The characteristics of witness samples at different locations inside the cavity revealed the uniform quality of the coating.
Niobium thin films are used in macroscopic SRF cavities for particle accelerators which are under study for microscopic superconducting qubits for quantum computing. The superconducting properties of niobium in microwave fields vary significantly with lattice defects and impurity content, where sub-at.% impurity level can reduce or increase microwave surface resistance by an order of...
