The effects of magnetic field on single-surface resonant multipactor

The single-surface resonant multipactor in dielectric-loaded accelerating structures has been found to result in serious power absorption [J. G. Power et al., Phys. Rev. Lett. 92, 164801 (2004)]. This paper presents an effective method for suppressing the resonant multipactor via an external dc magnetic field B satisfying special amplitudes. Using three-dimensional dynamic calculations and electromagnetic particle-in-cell simulations, the suppression mechanism is researched. The variation of the magnetic field is investigated for the ratio of the gyro-frequency to the rf satisfying Ω/ω ∈ (0.25, 2), over which the suppression effect for the multipactor initially improves and then weakens.