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Description
Accelerating cavities are commonly equipped with RF loads to absorb energy deposited by the beam into higher-order modes (HOMs). These modes generate electromagnetic wakefields that can induce transverse and longitudinal kicks in the beam, potentially leading to beam instabilities.
This work investigates a novel type of HOM absorber based on resistive coatings deposited on dielectric substrates. The shape of the dielectric and the resistivity of the coating have been optimized to improve the load performance and integration in X-band accelerating cavities for the Compact Linear Collider (CLIC). The study includes experimental characterization of NEG coatings with the target surface resistance of 200 Ω/□ applied to alumina substrates, as well as low-power RF measurements. In addition to room-temperature applications, this approach is also explored as a potential solution for RF loads operating at cryogenic temperatures, where conventional lossy dielectrics are not suitable.
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