Beam Coupling Impedances of Traveling-Wave Ferrite-Free Extraction Kickers

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Fast traveling-wave extraction kickers contain no ferrite and consist of two long metallic parallel plates supported by insulators inside a beam pipe. A beam is deflected by both the electric and magnetic fields of a TEM wave created by a pulse propagating along the strips in the direction opposite to the beam. Computations of the beam coupling impedances for such structures are difficult because of their length. In the paper, the beam coupling impedances of such transmission-line kickers are calculated by combining analytical and numerical methods: the wake potentials computed in short models are extended analytically to obtain the wakes for the long kickers, and then the corresponding beam impedances are derived. As one can expect, at very low frequencies the results are in agreement with simple analytical expressions available for the coupling impedances of striplines in beam position monitors.

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