Speaker
Description
In preparation for the High-Luminosity LHC (HL-LHC) era, a significant upgrade to the LHC Low-Level RF (LLRF) Beam-Control system is being implemented. The installation of crab cavities during Long Shutdown 3 (LS3, 2026-29), together with the obsolescence of existing components, necessitates a modernization of the LHC LLRF architecture.
The upgraded Beam-Control system - based on MicroTCA and VME hardware - replaces the frequency program and reconstructs a digital master RF. These frequencies are transmitted over a White-Rabbit (WR) network in the form of Frequency Tuning Words (FTW) to maintain synchronization among the distributed RF devices. This approach enables a scalable RF distribution infrastructure across the accelerator complex and experiments, with improved phase stability and reduced noise.
This paper presents the motivation and design of the upgraded system, including the method used to achieve robust phase synchronization over WR. Finally, it shows results obtained from a dedicated test with beam acceleration in the LHC.
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