Speaker
Description
The Future Circular Collider (FCC) will employ 400 MHz elliptical cavities with niobium coating on copper substrates. Since the performance requirements of the FCC are higher than those of the Large Hadron Collider, which has similar operating conditions, a “seamless” substrate without welding seams is being investigated to achieve these requirements. Hydroforming is one of the methods to fabricate seamless-cavities for mass production, and the first prototype series of 1.3 GHz single-cell cavities for R&D was completed in 2023 through a collaboration between CERN and KEK. The cavities were hydroformed by KEK, niobium thin film was coated on them by CERN with HiPIMS, and their performance was measured by both KEK and CERN. Although the surface resistance was not small enough in high field, the target accelerating gradient 12 MV/m was achieved.
Funding Agency
Amada Foundation
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