Efficient hybrid approach to the electromagnetic design of resonant cavities for side-coupled linacs

Abstract

A novel hybrid analytical/numerical approach, implemented via homemade code, is exploited to design the microwave cavities of a linear accelerator (linac) characterised by a very complex geometry. A finite element method-based three-dimensional investigation is integrated with a multi-objective particle swarm optimisation technique in order to automatically design and optimise the geometry of the linac cavities. The cavity optimisation takes into account the typical figures of merit of a linac design. The hybrid approach is used to design a 27 MeV 3 GHz standing-wave side-coupled linac tank of 35 cavities including the end cells. The promising simulated results suggest that a global search approach is a useful and flexible tool for the electromagnetic design of accelerator cavities as well as other complex resonating multicavity structures.

Keywords

• accelerator RF systems
• linear accelerators
• accelerator cavities
• finite element analysis
• cavity resonators
• particle swarm optimisation
• frequency 3.0 GHz
• electron volt energy 27.0 MeV
• complex resonating multicavity structures
• accelerator cavities
• global search approach
• linac tank
• linac design
• cavity optimisation
• linac cavities
• multiobjective particle swarm optimisation technique
• finite element method-based three-dimensional investigation
• complex geometry
• linear accelerator
• microwave cavities
• homemade code
• novel hybrid analytical/numerical approach
• side-coupled linacs
• resonant cavities
• electromagnetic design
• efficient hybrid approach