2-D simulation of electron movement on dielectric window surface under high power microwave

A 2-D simulation model of electron movement on the dielectric window surface under HPM in vacuum is established, and the influences of microwave electromagnetic field and dielectric surface electrostatic field are considered. The influences of different emergence angles of electron and microwave electromagnetic parameters are investigated, such as the amplitude and frequency of electric field, and the phase of electric field when electrons are emitted from the surface. Movement trajectories of electrons under complex field and state parameters when electrons return to the dielectric surface are obtained by simulation, such as impact energy and return time. Variation laws of electron movement with emergence angle and microwave electromagnetic parameters are also derived. The emergence angle of electron has significant effect on the movement of electron, and there is an emergence angle in which the electron has the maximum trajectory length and impact energy. Impact energy will increase and return time will reduce as increasing the amplitude of electric field, and both parameter would oscillate with the phase of electric field, which can essentially explain that multipactoring electron number oscillates in twice the frequency with the increase of microwave frequency, electron trajectory will change from parabolic-like movement to complex oscillation.