Suppression of high-power microwave dielectric multipactor by resonant magnetic field

Abstract

Through dynamic calculation and electromagnetic particle-in-cell simulation, high-power microwave dielectric multipactor is discovered to be suppressed by utilizing external dc magnetic field parallel to the surface, perpendicular to the rf field and satisfying the gyrofrequency close to the rf frequency Ω∼ω. It is found that multipactor electrons emitted from the surface can be resonantly accelerated to obtain the impact energy εe higher than the second crossover energy, leading to secondary emission yield lower than one. Besides, the corresponding flight time gets close to the rf period, also the period of the vector Erf×B, resulting in secondary electrons immediately pulled away without multipactoring along the surface. What is more, with the rf field increasing, suppression effect can be further enhanced due to εe rising.