This paper presents the design of magnets for the storage ring of the 3-GeV Taiwan Photon Source project. Detailed calculations of the field were performed according to a three-dimensional model, and the magnetic geometry was determined in transverse and longitudinal planes to conform to highly precise magnetic fields. The final tolerances of the pole profiles of the magnets within 20 were manufactured and measured in all prototype magnets. The characteristics of the magnetic fields were measured with Hall-probe and rotating-coil systems to verify the quality of the magnetic fields. The centers of the magnets will be aligned on the girder with precisely machined rails within 20 , and the magnets have no provision for shimming on the girder. The features of the main field and homogeneity of these magnets are described and analysed to reveal the satisfactory magnetic performance.Index Terms-Accelerator magnet, dipole magnet, field measurement, quadrupole magnet, sextupole magnet.

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The septum magnet bends the injection beam before the kicker magnet. The septum magnet is located near the storage ring in the Taiwan Photon Source (TPS). As the space from the magnet wall to the vacuum chamber of the ring is less than 3 mm, the leakage field of the septum magnet thus influences the stability of the electron beam in the storage ring. The main field and the leakage field of a septum of the direct-drive type are compared to one of the eddy-current type. The effects of the vacuum chamber and -metal are simulated with full-sine and half-sine current pulses with the OPERA-2D TR analysis module; measurement results are presented in this paper.

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