Using a full-sine septum power supply to study the top-up orbit disturbance at Taiwan light source

Observation shows that the electron orbit of the TLS (Taiwan light source) storage ring was greatly disturbed during the top-up injection process, both from BPM readings and beam profile monitor. The distortion duration exceeds the pulse lengths of both injection kickers and septum. One of the speculated possible causes would be due to the eddy current effect induced by the leak field of septum magnet. For clarification purpose, we have constructed a full-sine septum power supply and implemented the field in order to eliminate the said eddy current effect. The study shows that both pulse shape matching among four kickers and septum leakage field play major influence on the causes. This report will present the experimental results.