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 Omega/omega is an element of (0.25, 2), over which the suppression effect for the multipactor initially improves and then weakens. (C) 2011 American Institute of Physics. [doi:10.1063/1.3642958]