A Comparision of Theoretical and Actual Beam Performance of a 140 MeV Electron Linear Accelerator at the Universiiy of Saskatchewan

The electron beam optics of the injector and microwave system of a two klystron, four-section linear accelerator with an unloaded beam energy of 140 MeV are discussed. The injector contains a mnicrowave chopper, a nanosecond inflector and a prebunching assembly so that a wide variety of different injection conditions can be presented to the machine. The waveguide sections are of non-uniform impedance design and each is energized by 8.5 megawatts peak r-f power. The design parameters of the waveguide sections are discussed together with the electron beam dynamics for various modes of injector operation, and some comparisons are made with measurements of the electron beam characteristics.