Fabrication and tests of prototype quadrupole magnets for the storage ring of the Advanced Photon Source

Prototype quadrupole magnets for the Advanced Photon Source storage ring have been fabricated and tested. Mechanical stability of the magnet poles and acceptable field quality have been achieved. The measured magnetic fields in terms of multipole coefficients for the prototypes meet the requirements for the positron beam dynamics. Use of removable pole-tip geometries of pole-end bevels has been investigated in order to design the magnet endplate. In order to improve the excitation efficiency for the operation above 7 GeV, the pole geometry has been modified for the production magnets.<
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