Speaker
Description
Magnetic alloy-loaded RF cavities are critical components in scaling Fixed-Field Alternating Gradient (FFAG) accelerators, enabling ultra-high acceleration gradients and broad frequency operation without tuning. As FFAG accelerators advance toward higher power applications, enhanced cavity performance through improved magnetic core design becomes essential. Current large-scale magnetic cores fabricated from 18-micrometer nanocrystalline ribbons face limitations in shunt impedance for high-power operation. While ultra-thin ribbons (13-micrometer) theoretically offer superior performance through increased permeability and reduced eddy current losses, practical implementation encounters significant challenges including high costs, manufacturing difficulties, and stress sensitivity in large cores. This study proposes a novel nested core architecture utilizing selective ultra-thin ribbon placement in specific radial regions while maintaining conventional thickness materials elsewhere. Through theoretical analysis and simulation, we demonstrate that this approach not only provides cost-effective impedance enhancement but also redistributes magnetic flux density to improve temperature uniformity—critical for high-power FFAG applications. The nested design addresses power scaling challenges while maintaining economic viability, offering a promising solution for next-generation FFAG accelerator systems.
