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Resistive-wall impedance usually constitutes a significant percentage of thetotal beamcoupling impedance budget of an accelerator. Reduction techniquesoften entail high electrical-conductivity coatings. This paper investigates theuse of negative-permittivity or negative-permeability materials for sensiblyreducing or theoretically nearly cancelling resistive-wall impedance. Theproposed approach is developed by means of an equivalent transmission-linemodel. The effectiveness of such materials is benchmarked for the negativepermeability case with experimental measurements in two frequency bandwidths.This first-stage study opens the possibility of considering metamaterials forimpedance mitigation.

Metamaterial insertions for resistive-wall beam-coupling impedance reduction