Speaker
Description
The FCC-ee high-energy booster RF system consists of 112 superconducting cavities at 800 MHz for the operation modes at Z, WW, and H(ZH) energies, with an additional 408 cavities for the t t̄ stage. The first set of working points requires a wide total voltage range from 50 MV to 2 GV. To cover this huge range, Reverse Phase Operation (RPO) will be employed. It groups the cavities into focusing and defocusing families, according to their phase. To achieve the relevant operation modes of the booster and provide sufficient voltage per cavity, the RF power requirements are estimated and minimized analytically with a defined detuning program, including Lorentz force detuning compensation. Additionally, transient power requests of the RF system in the RPO operation are dynamically computed using the BLonD 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. The mitigation measures for the power transients are discussed in this contribution.
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