  We present an analytic method to minimize the magnetic cross-talk in
twin-aperture cos-theta dipoles. In the single-aperture cos-theta layout, the
coil design can be performed with an analytic approach, based on a sector coil
approximation. This method allows a fast evaluation of the field harmonics and
an almost exhaustive scan on the positions and dimensions of the sectors, for
coil layouts made of a different number of sectors. This increases the
probabilities to find the coil shape which best fits the specifications. In a
twin-aperture arrangement, the magnetic cross-talk can be not negligible and,
to the aim of an analytic minimization of the unwanted multipoles, an extension
of the single-aperture sector model is required. This is the case of the
recombination dipole D2 for the High Luminosity LHC and of the 16-T bending
dipole for the Future Circular Collider (FCC). This analytical method has been
used to find alternative coil designs for both dipoles.
