Stato del design magnetico dei quadrupoli del final focus per lo schema "Large crossing angle" della SuperB

Aula Seminari (Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati)

Aula Seminari

Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati

Via Enrico Fermi 40 00044 Frascati

The vertical focusing element closest to the interaction point of the SuperB factory based on the large crossing angle collision scheme (~50 mrad), should provide a pure quadrupolar field on each of the two beams. This allows to avoid the high background rate in the detector which would be produced by the over-bend of the off-energy particles if a dipolar component of the field were present. Because of the small separation of the two beams in the transverse dimension (only 2 cm) 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 design, based on “helical-type” windings, has therefore been investigated. The shape of the windings has been optimized so that the quadrupolar field is produced by the superposition of the inner field of the surrounding coil and of the outer fringe field of the neighbor one. In this talk the 2D concept and the 3D model of this design are presented.

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