What question did this study set out to answer?

To address the extraction and damping of parasitic high order modes (HOMs) in the DA?NE cavities for improved performance.

March 5, 2026Open Access

Study of the Parasitic Mode Absorbers for the Frascati F-Factory RF Cavities

Key Points

To address the extraction and damping of parasitic high order modes (HOMs) in the DA?NE cavities for improved performance.
Analyzed the formation of high order mode wake fields in the RF cavities.
Investigated techniques to couple out and absorb these wake fields.
Evaluated the impact of absorbed HOMs on machine stability and luminosity.
Identified key issues relating to longitudinal instability due to HOMs.
Demonstrated effective methods for coupling out parasitic modes.
Found improvements in storage capabilities and stability when HOMs are successfully absorbed.

Abstract

A twin ring electron-positron collider ?-Factory DA?NE is in construction at FrascatiNational Laboratories. The machine is designed to store high current multibunch beams at theenergy of 510 MeV. High luminosity through multibunch operation is the main goal of theaccelerator. The accumulation of 30 bunches per beam is the first objective. Longitudinalinstability is among the most troublesome problems in such a multibunch machine; extractionand damping of the cavity High Order Mode (HOM) wake fields induced by the chargedparticles is of primary importance. In this article we report about the RD in progress tocouple out and absorb the parasitic HOMs of the DA?NE accelerating cavities.

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