Speaker
Description
The goal of the discussed collaboration is to produce proof-of-principle 1.3 GHz single cell cavities by hydroforming the copper cavity substrate, then applying a 6 micrometer niobium layer on the inside.
The substrate forming process was optimized by the mechanical engineering section of CERN and KEK then they were produced by an industrial partner in Japan. Later the niobium layer was deposited at CERN by HiPIMS (High-power Impulse Magnetron Sputtering) method. The RF performance of the cavities were then measured both at KEK and CERN. The repeated measurements gave us the opportunity to find some key differences in the measurement methods of the institutes, and proved the reproducibility of the measurements.
In this presentation the production and RF measurement of the cavities will be discussed, comparing both the production (cost, time, etc.) and the
performance of hydroformed cavities to other similar Nb-on-Cu cavities tested on the same measurement stand at CERN (e.g. bulk machined cavities).
