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 introduction of crab cavities during Long Shutdown 3 (2026-29) and the obsolescence of 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 the results obtain from a dedicated test with beam accelerated in the LHC
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