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Description
The Radiofrequency Quadrupole (RFQ) is the initial accelerating device in many modern linear accelerators (linacs), such as the European Spallation Source (ESS), where it accelerates protons from 75 keV to 3.6 MeV. Due to its complex geometry, RFQ beam dynamics are typically studied using finite element solvers, which, while accurate, are computationally intensive and unsuitable for online modeling. The widely used analytical "two-term" model, originally introduced by I. M. Kapchinsky and V. A. Teplyakov, provides a faster alternative but often suffers from inaccuracies, with errors in particle dynamics tracking reaching up to 20\%, particularly with high-intensity beams. This paper presents a comprehensive analytical model for the RFQ, detailing how to derive its coefficients based on boundary conditions induced by the RFQ geometry and demonstrating its application for particle transport simulations.
| Paper status | Proceeding files received |
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