High power density, thin magnetic D.C. septa for AmPS

Both the injection and extraction line of the Amsterdam Pulse Stretcher ring (AmPS) contain a d.c. septum magnet. The 400 mm long injection septum, located inside the ring vacuum, requires 1075 A in its winding to generate the maximum field of 0.135 T. The 700 mm long extraction septum is outside the vacuum and consists of 2 turns to generate a maximum field of 0.271 T at 2160 A. The injection septum directs the beam parallel to the ring axis by a downward bend. The magnetic extraction septum bends the extracted beam, initially intercepted and separated from the circulating beam by the electrostatic extraction septum. (R.P.) 8 refs.; 5 figs