Speaker
Description
800 MHz SRF cavity and cryomodule developments at FNAL towards FCC have been progressing through active and fruitful collaboration with CERN colleagues. With the recently published FCC Feasibility Study Report, the 800 MHz systems have changed from 5-cell to 6-cell bulk Nb cavities, and employ 112 cavities in 28 cryomodules for the booster up through the ZH operating point. At the ttb operating point, the booster will require a total of 448 800 MHz cavities in 112 cryomodules, and the collider will have an additional 408 cavities in 102 cryomodules. The performance requirements of 20 MV/m at Q0 = 3e10 are challenging but feasible given optimization of current RF surface processing techniques. With support from CERN colleagues, FNAL is exploring medium-temperature baking in 5-cell and 1-cell cavity formats. In addition FNAL is collaborating on the mechanical design of the 6-cell cavities and cryomodules, based on experience with PIP-II designs and production. We present updates and future plans for 800 MHz SRF R&D for FCC in this talk.
