Iron-free CCT magnet design offers many advantages, one being the excellent
field quality and the absence of multipole components. However, edge effects
are present, although they tend to integrate out over the length of the magnet.
Many modern accelerator applications, however, require that these magnets are
placed in an area of rapidly varying optics parameters, so magnets with greatly
reduced edge effects have an advantage. We have designed such a magnet (a
quadrupole) by adding multipole components of the opposite sign to the edge
distortions of the magnet. A possible application could be the final focus
magnets of the FCC-ee, where beam sizes at the entry and exit point of the
magnets vary by large factors. We have then used this technique to effectively
eliminate cross talk between adjacent final focus quadrupoles for the incoming
and outgoing beams.Comment: Poster presented at MT25,25th International Conference on Magnet
Technology, Amsterdam, August 27 - September 1, 201
