Operation characteristics of a 12-cavity relativistic magnetron with diffraction output when considering secondary and backscattered electrons emission

Summary form only given. The former particle-in-cell simulation (PIC) of 12-cavity relativistic magnetron with diffraction output (MDO¹) was demonstrated a splitting of the radiation frequency for each eigenmode owing to its different longitudinal distribution. And scenarios and frequency switching for this 12-cavity magnetron was considered in our earlier work. The PIC simulation found when 12-cavity MDO driven using a 400kV applied voltage, the energetic electrons emitted from cathode strike on the relativistic magnetron´s anode block, emitting secondary and backscattered electrons. The resultant secondary and backscattered electron current lowers the output power, especially when the relativistic magnetron was driven using a short applied voltage pulse. And this phenomenon leads to the operation spectrum for 12-cavity MDO more complicated that when considering mode switching, the boundary of neighbour modes should be considered carefully.