Developments of DC septum electromagnet for next-generation light sources

We developed a DC septum electromagnet for next generation light sources. A high current density in the coils is the common key issue for DC septum magnets, as it results in high power consumption as well as a source of device trouble in long accelerator operation. We designed the DC septum magnet so that the coils are placed away from the median plane, yet the leakage fields are sharply reduced by introducing an iron septum shield. We fabricated the magnet and confirmed that the measured magnetic fields distribution well agree with our numerical simulations. (author)