LLRF Topical Workshop on Advanced Feedback Control (TWoAFC)

A Systematic Methodology for equivalent Circuit Modelling of Particle Accelerator Resonant Cavities for Control Applications

Oct 14, 2026, 9:05 AM

30m

Nova Gorica, Slovenia

Oral System Identification Control Loop Modeling, Tuning and Optimization

Speaker

Beñat González (University of the Basque Country UPV/EHU)

Description

Resonant cavity models traditionally used for control design suffer from oversimplification, failing to capture spatial actuation effects or geometric imperfections. To address this limitation, we present a methodology for deriving cavity models via equivalent circuit representations. Most accelerator cavities (such as Tesla structures, RFQs, or DTLs) can be decomposed into elemental units (cavities, cells, or stems). The proposed framework models each unit and its
inter-component coupling using electronic circuits, leveraging electromagnetic software (e.g., CST, ADS) for parameter extraction. The resulting model improves the simulation efficiency due to its circuital representation. Furthermore, because the controller typically shares this circuit-based nature, the entire closed-loop system can be co-simulated within a single software environment. This enhanced model enables precise LLRF control that accounts for cross-coupling effects, laying the foundation for advanced control strategies.
This work was supported in part by the project PID2023-148792OB-I00
funded by MICIU/AEI/10.13039/501100011033 and by ERDF, EU