Ultramet, California, USA
Ultramet continues to develop a fabrication methodology to construct high-performance (RRR>200), seamless niobium superconducting radio frequency (SRF) cavity cells on low-cost removable mandrels utilizing advanced chemical vapor deposition (CVD) technologies. Optimization of the CVD niobium material and process to improve as-deposited niobium purity levels has resulted in the consistent rapid deposition of RRR>200 niobium at structural thicknesses suitable for accelerator applications. Boundary layer material applications on removable low-cost mandrels used successfully in previous work were further optimized and characterized. Basic CVD niobium joining/welding capabilities have been demonstrated as a potential alternative to electron beam welding, and preliminary mechanical and microstructural characterization of the joined area were performed.
