Speaker
Description
A simple and cost effective approach to a beam-driven THz-source is based on the interaction of the particle beam with its own wakefield. The latter is generated in a dielectric loaded or otherwise inhomogeneous waveguide-like structure, which supports the propagation of slow-wave electromagnetic modes. Recently, the application of Antiresonant Fibers (ARFs) has been proposed for use as a THz-radiator. Due to their complex geometry, the characterization of ARFs in terms of their beam coupling impedance is hardly accessible to theoretical analysis and/or to the available wakefield codes (such as CST, Gdfidl, etc.). In this contribution, we will present a numerical method based on the high-order finite element method, which allows for accurate waveguide-mode and impedance simulations of these structures. In particular, we will demonstrate the impedance spectrum of so called revolver-type ARFs, when excited by um-size, ultrarelativistic electron bunches.
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