Speaker
Description
PERLE is a high-power ERL demonstrator operating at 801.58 MHz, designed to deliver high intensity electron beams with energy recovery. The superconducting RF cavities operated at 2K are extremely sensitive to mechanical and electromagnetic perturbations such as microphonics, Lorentz force detuning and beam loading. This leads to high demanding
requirements on the amplitude and phase stability of the accelerating field, and the time frequency reference distribution, which must exhibit very low jitter.
This aim of this work is to design, dimension and experimentally validate a digital LLRF system for PERLE capable of achieving very stringent phase and amplitude stability, while minimizing RF power and ensuring robust operation against cavity perturbations. The architecture relies on a µTCA/FPGA platform for real time control and a reference generation and distribution system based on the White Rabbit protocol, including the use of an IDROGEN board integrating a enhanced WR hardware and firmware.
The definition of a preliminary noise and jitter budget was estimated, with the development of a first version of a cavity with its LLRF system on MATLAB/Simulink; in parallel a characterization and optimization of the White Rabbit system was studied. The next step will focus on the final definition of the LLRF architecture with experimental validation considering beam dynamics requirements
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