Speaker
Description
LLRF control of accelerating cavities with microsecond-scale pulses is challenging because the short pulse duration prevents effective use of conventional FPGA-based intra-pulse feedback, limiting control to pulse-to-pulse corrections. This is often insufficient in the presence of RF-chain-induced jitter to ensure the required field stability. To address this, we propose a novel intra-pulse feedback scheme for short pulses. The method is operator-friendly via auto-configuration and supports advanced pulse shaping, including SLED systems.
A first prototype implementing this approach has been deployed and routinely operated at INFN SPARC_LAB, likely the first realization of this type of feedback, demonstrating improved phase stability over pulse-to-pulse control.
We present here an upgraded second prototype for short-pulse operation, simplifying system integration. This paper presents its design and experimental validation, including measurements at INFN SPARC_LAB. The second prototype can be developed as an extension of the Libera LLRF platform, with strong potential for short-pulse accelerator applications.
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