Permanent magnet dipole with strong in-plane magnetic field

In this article, we present a permanent magnet dipole design with strong in-plane, open access magnetic field. The design starts with a Halbach structure. A pair of magnets with orientation opposite to the magnetic field of the Halbach dipole are added to cancel the effect of the two sections of the Halbach ring. The net result is equivalent to removing the two sections whose orientation is the same as the field in the gap. The final structure is a dipole with an open access air gap and a strong in-plane magnetic field. We analyzed the structure using current sheet method. We then used BEA (Boundary Element Analysis) software to simulate the structure. A prototype dipole was built. The field from the prototype dipole was measured and compared to the analytical and BEA results.