EM simulations of the LHC beam screens including the weld Preliminary analysis C. Zannini, E. Metral, G. Rumolo, B. Salvant

Model studied LHC design as it is built and installed In this step we are only interested to understand the effect of the weld . weld

Model studied a=46.4 mm b=36.8 mm w=2 mm L=1m w b a L

Comparing with and without weld For a displacement in x of 5 mm the horizontal dipolar wake with weld seems to be five time larger than the wake without weld

Horizontal dipolar wake with weld versus displacement The displacement is considered negative if it is in the direction opposite the weld The horizontal dipolar wake with weld for a displacement in x of -5 mm seems to be twenty-five time larger than the wake with weld for a displacement in x of 5 mm

Comparing dipolar terms xdip weld  2*xdip_noweld xdip 2weld  2*xdip_weld