Author: Fukuoka, S.
Paper Title Page
THPPP003 Coupling Impedance Study of the New Injection Kicker Magnets of the JPARC Main Ring 3725
 
  • K. Fan, S. Fukuoka, H. Matsumoto, T. Sugimoto, T. Toyama
    KEK, Ibaraki, Japan
 
  New lumped inductance kicker magnets have been developed for the J-PARC main ring injection system. For high intensity beam operation, the beam coupling impedance of the new kickers is a critical issue, which not only generates significant heating inside the ferrite impairing the performance of the kickers, but also drives beam instability. Numerical simulations based on CST studio have been studied during the design stage to optimize the kicker structure. Impedance measurements based on wire method have been carried out. The measured results agree well with the simulation results.  
 
THPPP004 Design and Test of Injection Kicker Magnets for the JPARC Main Ring 3728
 
  • K. Fan, S. Fukuoka, K. Ishii, H. Matsumoto, H. Someya, T. Sugimoto, T. Toyama
    KEK, Ibaraki, Japan
 
  The present injection kicker magnets of the JPARC main ring consists of three transmission type kickers. To overcome the operational problems, four lumped inductance kicker magnets have been developed for the simplicity and the high reliability. The tight requirements on the rise and fall time create difficulties for the new design. Magnetic field measurements, coupling impedance measurements and have been carried out. The measurement results show that the new kicker magnets can satisfy the requirements of beam injection.