A Gradient Ferrite Pulsed Inflector for 130 MeV Electrons

The injection path at the Cambridge Electron Accelerator requires a 10 milliradian inflection to insert the 130 MeV electrons into the synchrotron orbit. A fast pulsed ferrite magnet has been constructed, and is in routine use as the inflector. The ferrite is shaped to provide a magnetic field gradient of 38% per inch required by the design of the injection transport system. The pulser uses coaxial cable as a delay line, switched by a deuterium thyratron. The 750-nanosecond 400-ampere pulse has a fall time of less than 200 nanoseconds, allowing a synchrotron orbit fill of approximately 75%.