Magnetic field simulation and structure design of fast extraction Kicker for CSNS/RCS

Three kicker assemblies including eight pulsed magnets will be used in the rapid circle synchrotron of China Spallation Neutron Source. Magnetic field simulation and structural design of the kicker magnet is presented. The results of OPERA-3D simulation show that the central field integral of magnets meet the physical requirements by choosing a suitable magnet coil structure. The field uniformity in 60% magnet width is 0.7%. The relation between the distance of two magnets and the mutual inductance are simulated. Compared to the prototype, the magnet structure is modified and improved in design to increase the mechanical stability. A simple and practical design of multi-bolt sliding support structures which is used to push six magnets into the vacuum chamber is introduced.