A RADIATION RESISTANT LAMINATED SEPTUM MAGNET

A pulsed septum magnet is used to inflect the 200 MeV beam into the booster synchrotron at the National Accelerator Laboratory. The magnet which is approxi-mately 1 meter long is excited by a single turn coil to 3.3 kG at 10,000 amperes. Instead of supporting the septum with insulating material which is subject to radiation damage, the septum is welded to the magnet laminations. The current is confined to the septum by the insulation between the laminations which is a standard core plate material. The aperture is 1 1/2 " high x 2 " wide. The field is a half sine wave with a width of 400 ~sec which provides a peak field uniformity of 0.1 % for a duration of 12 ~sec as required for injection. I