The final doublets of the SuperB factory project [1], based on the large crossing angle collision scheme, must provide a pure quadrupolar field on each of the two beams to avoid the high background rates in the detector. Because of the small separation of the low energy (LER) and the high energy (HER) beams the influence of each winding on the other one is not negligible and, for the same space limitation, a multi-layer configuration is not suitable to compensate the high order multipoles. A novel helical-type design has been studied to compensate the fringe field of the quadrupole of one line onto the other one. The 2D algorithm and the 3D finite elements models of this design are presented.
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