Numerical simulation of the axial acceletron

A high power and alterable frequency axial acceletron is studied in this paper. By adding the middle cavity, the RF at the cathode surface is increased and the current modulation coefficient is enhanced, the first order current modulation coefficient is 140% and the second is 68%. By adjusting the output cavity, in terms of the twodimensional fully electronmagnetic particalincell(PIC) simulation, the output power of 1.25GW at 2.2GHz and 480MW at 4.4GHz have been obtained.