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The Heavy-ion Irradiation Facility (KAHIF) RFQ is transitioning its Low-Level RF (LLRF) infrastructure from a legacy analog system to a modern digital architecture to enhance the stability of its 25.96 MHz pulsed operation. The existing analog system faces limitations in precise phase regulation and compensation for the nonlinear pulse droop inherent in its vacuum tube amplifier chain.
This paper presents the design and verification of a digital LLRF controller featuring a purely electronic Auto Frequency Control (AFC) loop and a hybrid Feedforward-PID amplitude control logic. A key contribution of this work is the development of a high-fidelity RLC equivalent circuit model that serves as the physical plant in an integrated closed-loop simulation environment. Simulation results demonstrate that the digital architecture robustly tracks resonance deviations and mitigates amplifier-induced instabilities, ensuring superior field stability. This study provides the essential technical foundation for the subsequent FPGA-based hardware implementation.
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