Three-dimensional analysis of a vacuum window connected towaveguide

For an effective additional heating system in the experimental tokamak-type system the pillbox-type vacuum window is proposed to isolate each part. L.J.B. Bergeron's formulation (1941) of the pillbox-type vacuum window connected to cylindrical waveguides is described, and the fundamental characteristics of the electromagnetic field within this system are shown. Local heating at the surface of the dielectric disk may be decreased by reducing circumferential dependence by using cylindrical waveguides. A unified analysis involving the pillbox window and both the input-side waveguide and the output-side one has been performed using the presented method. The results obtained present the complex variations of the distribution of the field in the overall analyzed region as a function of the length of the pillbox window. These results illustrate the characteristics of the three-dimensional analysis. The analyzed model is described; in particular, the boundary conditions of the conductor are explained. The numerical results of the field distributions are shown by the longitudinal magnetic field variations and the electric field variations in the various cross sections in the pillbox window