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TIME-FREQUENCY ANALYSIS OF PARTICLE BEAM INTERACTIONS WITH RESONANT AND GUIDING STRUCTURES

By A. Semychayevskyy

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Abstract:
This article describes numerical solutions for the electromagnetic interactions, known as `wakefields', of a proton beam with an RF cavity and a beampipe. Using FDTD calculations, time-varying electromagnetic solutions are obtained. Unlike modal expansion methods, FDTD allows to compute transient wakefields due to proton beam passing through the structures. A popular time-frequency analysis approach, the short-time Fourier transform (STFT), is applied to the electromagnetic fields inside a resonant cavity and past an open-ended beampipe. STFT enables a more explicit interpretation of the transitions between the fields radiated by moving charges and the resonant modes. The described time-frequency analysis is useful to engineers and accelerator physicists who analyze proton beam dynamics. As an extension of electromagnetic simulations using an extended proton bunch, a numerical Green's function approach is proposed in order to account for the wakefields due to individual superparticles.

Citation:
A. Semychayevskyy, "Time-Frequency Analysis of Particle Beam Interactions with Resonant and Guiding Structures," Progress In Electromagnetics Research M, Vol. 73, 197-203, 2018.
doi:10.2528/PIERM18071203

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