The voltage ripple in the power supplies of the Collider generate ripp
le current in the magnet coil that, in turn, generates ripple in the m
agnetic field of dipoles and quadrupoles. The ripple in the magnetic f
ield will be a function of time and space due to the transmission line
effect. The work reported in this paper gives a thorough analysis the
frequency spectrum and the spatial propagation pattern of the differe
ntial mode ripple in the magnet strings for the injection mode and the
collider mode.