Speaker
Description
A novel bead-falling measurement method is proposed for precise and efficient electromagnetic field mapping in RF cavities for particle accelerators. Unlike the conventional bead-pull technique, which uses a complex wire-pulley system prone to perturbations and mechanical errors, this method employs free-falling beads to simplify the setup and significantly improve accuracy.A compact portable device integrating an automated bead release and detection system connected to a vector network analyzer (VNA) was developed. The technique was validated on a three-gap buncher cavity and a scaled Alvarez-type cavity, showing excellent precision and stability even under low signal-to-noise ratios and environmental vibrations.This method offers superior accuracy, reliability, and efficiency, making it a promising new standard for RF cavity diagnostics and tuning.
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