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Iron-free CANTED-cosine-theta 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 size at the entry and exit point of the magnets varies by large factors. We have then used this technique to eliminate cross talk between adjacent final focus quadrupoles for the incoming and outgoing beams.

A Method for Greatly Reduced Edge Effects and Crosstalk in CCT Magnets