What does this research mean for the field?

The Broadband Waveguide to Coaxial Transition (BTHD) effectively dampens high order modes (HOM) in particle accelerator RF cavities, mitigating coupled-bunch instabilities. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This research aims to develop a transition method for effective damping of high order modes in RF cavities of particle accelerators.

March 5, 2026Open Access

A Broadband Waveguide to Coaxial Transition for High Order Mode Damping in Particle Accelerator RF Cavities

Key Points

This research aims to develop a transition method for effective damping of high order modes in RF cavities of particle accelerators.
Developed a Broadband Waveguide to Coaxial Transition (BTHD) design.
Performed low power tests on a BTHD prototype.
Analyzed the conversion of cavity HOM energy into TEM coaxial mode.
Demonstrated effective conversion of high order modes to TEM coaxial mode.
Showed successful damping of coupled-bunch instabilities in multibunch storage rings.

Abstract

A novel Broadband Waveguide to Coaxial Transition for High Order Mode Damping in Particle Accelerator RF Cavities (BTHD) has been studied and developed in the framework of the Frascati Φ-Factory project DAPHNE. The cavity high order modes (HOM) are the primary source of coupled-bunch instabilities in multibunch storage rings. The energy delivered by the particle beam to the cavity HOMs and coupled out with waveguides is converted by BTHD into the TEM coaxial mode and dissipated by a 50Ω load connected via a ceramic feedthrough. This article deals with the design and the low power tests performed on a BTHD prototype and the considerations for a real application to an accelerator.

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