Calculation of wakefields in 2D rectangular structures

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Abstract

© 2015 authors. Published by the American Physical Society. We consider the calculation of electromagnetic fields generated by an electron bunch passing through a vacuum chamber structure that, in general, consists of an entry pipe, followed by some kind of transition or cavity, and ending in an exit pipe. We limit our study to structures having rectangular cross section, where the height can vary as function of longitudinal coordinate but the width and side walls remain fixed. For such structures, we derive a Fourier representation of the wake potentials through one-dimensional functions. A new numerical approach for calculating the wakes in such structures is proposed and implemented in the computer code echo(2d). The computation resource requirements for this approach are moderate and comparable to those for finding the wakes in 2D rotationally symmetric structures. Numerical examples obtained with the new numerical code are presented.

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Zagorodnov, I., Bane, K. L. F., & Stupakov, G. (2015). Calculation of wakefields in 2D rectangular structures. Physical Review Special Topics - Accelerators and Beams, 18(10). https://doi.org/10.1103/PhysRevSTAB.18.104401

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