Reducing parasitic resonances in particle accelerators components by broadband Higher–Order–Mode couplers

In particle accelerator components, parasitic resonances must be reduced because they heat up theequipment and cause beam instabilities. In this paper, a method for designing and characterizingHigher Order Mode (HOM) couplers for reducing such resonances in a broad bandwidth is proposed. Acase study is considered for a specific component, called QuattroTank, showing geometrical discontinu-ities and thus causing significant electro-magnetic resonances. Results of numerical simulation andexperimental emulation prove the capability of the proposed method to reduce the peaks and theQ-factor of the resonances.