Septum and kicker systems for the SLS

A total of nine pulsed magnets are used in the Swiss Light Source (SLS) machine. The three septum magnets are eddy current designs with a sheet of magnetic screening material around the stored electron beam to reduce the leakage field integral below 50 μTm. The excitation waveform. is a single-cycle sinewave pulse that is 150 μs long and up to 5 kA peak. However, the total dissipation is only 3 J/pulse, and so the open loop pulse amplitude remains stable to within +/-1×10^-3. There are four identical kicker magnets for injection into the storage ring. A symmetric bump is used in one of the long straight sections. The excitation waveform is a 6 μs half-cycle sine pulse up to 3 kA peak. The emphasis was on achieving the best possible tracking in time of the magnet field waveforms so that the residual closed orbit disturbance is minimized for top-up injection. The pulsers give currents identical to within +/-1×10^-3. The magnetic fields, including the effect of the metallised ceramic chambers, were plotted in three orthogonal axes and in time, giving animated "movie" of the magnetic field behavior