Evaluation of the Beam Coupling Impedance of New Beam Screen Designs for the LHC Injection Kicker Magnets

TL;DR

This paper evaluates new beam screen designs for LHC injection kicker magnets to reduce beam impedance and heating, ensuring safe operation at higher luminosities and intensities.

Contribution

It introduces and assesses novel beam screen designs aimed at lowering impedance and mitigating heating in LHC kicker magnets.

Findings

New beam screen designs show reduced impedance.

Heating estimates indicate improved performance at higher intensities.

Designs meet future upgrade requirements.

Abstract

During the 2011 run of the LHC there was a significant measured temperature increase in the LHC Injection Kicker Magnets (MKI) during operation with 50ns bunch spacing. This was due to increased beam-induced heating of the magnet due to beam impedance. Due to concerns about future heating with the increased total intensity to nominal and ultimate luminosities a review of the impedance reduction techniques within the magnet was required. A number of new beam screen designs are proposed and their impedance evaluated. Heating estimates are also given with a particular attention paid to future intensity upgrades to ultimate parameters.