The effect of grooved surface on dielectric window multipactor

Dielectric window breakdown remains a major limiting in transmission of high power microwave (HPM). The effect of surface roughness on multipactor from a periodic rectangular grooved surface under vacuum is investigated by using electromagnetic particle-in-cell (PIC) simulation. The microwave frequency is 2.86 GHz. Vaughan's secondary emission model [3] is used to calculate the secondary electron yield. Electron cloud space distribution, statistic energy and secondary emission yield et al. are analyzed under periodic grooved surface. It is found that grooved surface with some height and width can significantly reduce the secondary emission yield and suppress multipactor.