Speaker
Description
CERN's planned Future Circular electron-positron collider (FCC-ee) must accommodate very different RF system requirements at different energy points, driven by a fixed synchrotron radiation power budget of 100 MW. Recently, a unified RF cavity design with constant loaded quality factor suitable for three beam energies (45.6, 80, and 120 GeV) was adopted as the baseline. The new RF system implementation requires the inclusion of the reverse phase operation (RPO) scheme for the Z operating point (45.6 GeV). In this contribution, the main principles of the RPO scheme are first explained. The need to mitigate the enhancement of transient beam loading due to the RPO scheme is described, along with the corresponding LLRF and HLRF requirements to achieve precise control of the cavity field. Finally, the dynamics of the beam and RF system in the event of RF system failures are analyzed, including a detailed implementation of LLRF loops and interlocks.
| Abstract Category | System and Operation |
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