Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3360853
Keywords
electron-surface impact; flashover; high-frequency discharges; secondary electron emission; vacuum breakdown
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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 similar to omega. It is found that multipactor electrons emitted from the surface can be resonantly accelerated to obtain the impact energy epsilon(e) 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 E(rf)xB, 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 epsilon(e) rising.
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