Speaker
Description
The FCC high-energy booster RF system consists of112 superconducting cavities at 800 MHz for the operation modes at Z, WW, and H (ZH) energies, with an additional408 cavities for the tt ̅ stage. The first three working points require a wide total voltage range from 50 MV to 2 GV. To cover this huge range, Reverse Phase Operation (RPO) will be employed [1]. It groups the cavities into focusing and de-focusing families, according to their phase. To provide beam for the relevant operation modes with the booster and provide sufficient voltage per cavity, the RF power requirements are estimated and minimized analytically assuming a defined detuning program. This includes Lorentz force detuning compensation. Additionally, transient power requirements of the RF system in the RPO operation are dynamically computed using the BLonD tracking code. The simulations are performed with sparse profiles, to limit the beam observation to the filled buckets. An LHC-like cavity feedback is adapted to the booster characteristics and allocated to both RPO families. Mitigation measures to reduce the power transients are discussed in this contribution.