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Permanent magnet has a small and compact structure, is especially suitablefor a narrow space. With the aid of soft iron, the magnetic field can beincreased much more and the field uniformity can be well controlled. MostPermanent magnets have a symmetry structure; the soft iron can be selected asthe float magnet pole to keep its constant scalar potential, and take roles asmedia to collect the direct flux from the permanent blocks, then releaseindirect flux in magnet aperture and to the nearby return yoke. This paperpresents the magnetic flux method to design and fabricate a hybrid permanentdipole by using axially and radially magnetized permanent blocks. A variablegradient permanent quadrupole and a variable gradient sextupole are designed asthe extend design examples . They all consist of two nested hybrid permanentrings, where the iron poles are used to control the field quality, collect themagnetic flux from the outer ring, block the skew quadrupole and high orderharmonics.

Enhance the Field Strength by Adding Soft Iron in the Hybrid Permanent magnet