• V. Volkov, S.A. Krutikhin, G.Y. Kurkin, S.V. Miginsky, V.M. Petrov, M.A. Tiunov, N. Vinokurov
  BINP SB RAS, Novosibirsk

The projected electron RF gun of 10 MeV L-band injector for FEL employs a commercial thermionic cathode-grid assembly with 0.08 mm gap that conventionally used in metal-ceramic RF tubes. Three-dimensional (3D) computer simulations have been performed that use the mesh refinement capability of the both Microwave Studio (MWS) and 2D SAM codes to examine the whole region of the real cathode-grid assembly in static fields in order to illustrate the beam quality that can result from such a gridded structure. These simulations have been found to reproduce the beam current dependency on applied potentials that are observed experimentally. Based on it ASTRA RF beam simulations also predict a complicated time-dependent response to the waveform applied to the grid during the current turn-on, calculation of the dissipated power by electrons at the grid, and particle tracking downstream of the grid into RF gun cavity and further on. These simulations may be representative in other sources, such as BINP Microtron-Recuperator 180 MHz injector and other RF injectors for industrial and scientific applications.