PARAXIAL APPROXIMATION IN THE REGION OF FORMATION OF ELECTRON BEAM OF PLANAR GYROTRON

The flow structure and the Laplace field implementing this structure are investigated on models that include various options for specifying the beam axis and the potential on it, taking into account the asymptotics of the antiparaxial theory during emission in the T-mode. The problems of non-uniform distribution of parameters on the cathode surface and the formation of the ends of a ribbon beam with a cross-section deformed due to the drift velocity are discussed.