Coaxial Wire Measurements of Ferrite Kicker Magnets

TL;DR

This paper presents measurements and analysis of the impedance of CERN's ferrite kicker magnets, highlighting their effects on beam stability and heating, with comparisons to analytical and numerical models.

Contribution

It provides detailed impedance measurements and compares them with analytical and numerical predictions for ferrite kicker magnets.

Findings

Impedance measurements reveal significant beam-induced heating risks.

Analytical and numerical models show good agreement with measurements.

Results inform design improvements for high-intensity beam stability.

Abstract

Fast kicker magnets are used to inject beam into and eject beam out of the CERN accelerator rings. These kickers are generally transmission line type magnets with a rectangular shaped aperture through which the beam passes. Unless special precautions are taken the impedance of the yoke can provoke significant beam induced heating, especially for high intensities. In addition the impedance may contribute to beam instabilities. The results of longitudinal and transverse impedance measurements, for various kicker magnets, are presented and compared with analytical calculations: in addition predictions from a numerical analysis are discussed.