Multipactor studies for the FCC-ee superconducting SWELL cavities
Résumé
The Future Circular electron-positron Collider (FCCee) is a proposed new storage ring of 91 km circumference, which has been designed to carry out a precision study of Z, W, H, and ttbar with an extremely high-luminosity and unprecedented energy resolution. Given the high-energies, ranging from 45.6 to 183 GeV, the Synchrotron Radiation (SR) power is assumed to be limited to 50 MW per beam in all operation modes. A high-performance RF system based on Superconducting Cavities (SC) is supposed to compensate for SR losses. Different SC technologies are currently under study for such a system, the Slotted Waveguide ELLiptical (SWELL) being one of the possible solutions. In this paper, we numerically compute the position of the multipacting barriers of a SWELL cavity prototype, resonating at 1.3 GHz. We benchmark it against the TESLA cavity barriers, which are well documented. First results show that the SWELL cavity is less prone to multipacting in its operation range than the equivalent TESLA one.
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