Permanent Magnet Dipoles for a Synchrotron Radiation Source

Possible designs of an undulator structure based on permanent magnets with an alternating field are discussed. The material chosen was a rare earth (Rare Earth Permanent Magnet, REPM) alloy Nd–Fe–B, which has a significantly higher residual magnetization compared to the Sm–Co alloy and is capable of providing increased coercivity. Among the most effective designs, in addition to the hybrid dipole magnet, it is preferable in practice to use an implicit multipole of both sector and rod types as well as one manufactured using QSM technology. The paper presents the spectra of the longitudinal field distribution in the regular part of various undulator structures.