Main factors influencing the effect of suppressing multipactor by periodic surface profiles and resonant magnetic field

Summary form only given. Breakdown at the vacuum/dielectric interface is triggered by multipactor and finally realized by plasma avalanche in the ambient desorbed or evaporated gas layer above the dielectric. We have theoretically and experimentally demonstrated that the periodic surface profiles and external resonant magnetic field can prominently increase the HPM breakdown thresholds. The main factors determining the effect of suppressing multipactor are analyzed and emphasized in this talk, including the slope angle, periodic size, rf frequency, rf field amplitude, dc magnetic amplitude, pressure and dielectric constant. These factors play significant important role on improving breakdown thresholds.