Abstract
Effects of microwave frequency on the growth rate of an upstream dielectric multipactor are studied. Our previous research (2018 Plasma Sources Sci. Technol. 27 125006) shows that the growth rate is independent of microwave frequency in a strong microwave. However, this note shows that the growth rate would decrease quickly to a negative value if the microwave frequency increases to be above a critical value (far away from the first crossover point of unit secondary yield). This phenomenon is observed using electromagnetic particle-in-cell simulation on a dielectric exposed to microwaves of TEM modes TE01 mode, and TE11 mode, respectively. Consistent simulation results and theoretical results show that the suppression of the multipactor is induced from the returning difficulty of emitted electrons, and the critical microwave frequency corresponding to zero growth rate is in direct proportion to the rf electric field amplitude and is in positive correlation with the secondary electron yield.
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