• M. Gu, Z.H. Chen, B. Liu, L. Ouyang, R. Wang, Y. Wu, Q. Yuan
  SINAP, Shanghai

The in­jec­tion sys­tem com­posed of four kick­ers and two septa in the SSRF have been built and op­er­at­ed. The com­mis­sion­ing shows that fine in­ject­ing ef­fi­cien­cy and small­er dis­tur­bance are car­ried out. The sep­tum mag­nets are eddy cur­rent de­signs with a sheet of mag­net­ic screen­ing ma­te­ri­al around the stored elec­tron beam to re­duce the leak­age field. The beam tube with RF fin­ger flanges at each end is added to keep the con­ti­nu­ity of impedance for the cir­cu­lat­ing beam. The pulser ex­cite the sep­tum with 60μsec­ond wave­form of half sine-wave and 8kA peak cur­rent. Four iden­ti­cal kick­er mag­nets pro­vide the sym­met­ric bump in 10 meter long straight sec­tions. The ex­ci­ta­tion wave­form is a 3.8μsec­ond half sine pulse up to 7 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 per­for­mance of the in­jec­tion sys­tem with these pulsed mag­nets are de­scribed.