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Reduction of the beam-coupling impedance in accelerating structures using metamaterial-based absorbers

Resistive-wall impedance constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. Under extreme conditions, like large power handling and ultrahigh vacuum, metamaterial-based absorbers can represent a valid alternative to other approaches for impedance miti...

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Detalles Bibliográficos
Autores principales: Masullo, M R, Pugliese, A, Chikhi, N, Vaccaro, V G, Losito, R, Masi, A, Koral, C, Papari, G P, Andreone, A
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:https://dx.doi.org/10.1109/metamaterials.2018.8534145
http://cds.cern.ch/record/2838136
Descripción
Sumario:Resistive-wall impedance constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. Under extreme conditions, like large power handling and ultrahigh vacuum, metamaterial-based absorbers can represent a valid alternative to other approaches for impedance mitigation in specific accelerator components, like resonant (parasitic) cavities or collimators operating along the beam line. We design sub-wavelength 2D metallic resonant structures based on split rings or on 3D hyperbolic tapered waveguide arrays that can be employed as mode dampers in accelerating structures. A number of prototypes are fabricated and then measured in a “test model” pillbox cavity.