Metamaterial-Loaded Waveguides for Accelerator Applications.pdf

Metamaterial-Loaded Waveguides for Accelerator Applications Sergey Antipov Argonne Wakefield Accelerator Group, Argonne, IL Illinois Institute of Technology, Chicago, IL Beams and Applications Seminar APS, Argonne, April 13th, 2007 Outline of the talk Introduction to metamaterials – Artificial εand µ – Properties of LHM – Simulations and Measurements Metamaterial-loaded waveguides – Dispersion analysis – Wakefield generation – Applications Conclusion, future directions Sergey Antipov, IIT / ANL 2 Introduction Metamaterials (MTM) are manmade materials with desired (electromagnetic) properties. For simplicity of design and manufacturing they are arrays of cells or basic elements Effective media ( ) ( ) ⇒∃ d and λ ε ω μ ω ˆ ˆ approximation d For 10GHz (3cm wavelength) element size is ~3mm εand μcan be negative! Sergey Antipov, IIT / ANL 3 Sergey Antipov, IIT / ANL 4 Artificial permeability, Split Ring Resonator (SRR) B 2 ω μeff −1 2 2 ω ω −γω+ 0 i negative?! GHz design requires mm-scale elements to satisfy