Effect of geometrical alignment on the beam optics of the TT41 CNGS proton transfer line

It has been shown that horizontal bending dipoles introduce a small roll angle of the beam when they are installed with an inclination with respect to the local beam reference coordinate system. Furthermore, they couple the horizontal and vertical trajectories and may therefore make the steering more difficult. In this note we estimate this effect on the CNGS proton beam line TT41 and propose a strategy for the alignment of the elements, following the method developped for the LHC beam transfer line TI8.