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

During the 2011 run of the LHC there was a signi� - cant measured temperature increase in the LHC Injection Kicker Magnets (MKI) during operation with 50ns bunch spacing. This was due to increased beam-induced heat- ing of the magnet due to beam impedance. Due to con- cerns about future heating with the increased total inten- sity to nominal and ultimate luminosities a review of the impedance reduction techniques within the magnet was re- quired. 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 up- grades to ultimate parameters.