A new design for an active–passive septum magnet

A septum magnet for synchrotron light sources of intermediate energy, like the Laboratory de Llum de Sincrotrَ de Barcelona (LLS), is presented. This septum is a hybrid between the passive and active types, which combines the advantages of both designs, especially with regard to the field quality, the stray fields and power losses, without significant technical complications. The performance of the proposed septum magnet is compared with that of an active and a passive septum magnet.