Beam-wave interaction for a W band traveling wave tube(TWT)based on staggered double rectangular waveguide structure(SDRWS)is calculated by CST PIC,showing that the TWT has over 35 Woutput power and over 30 dB gain and about 5% electron efficiency from 92 GHz to 97 GHz on the condition of a 10 kV,70 mA beam.Even if the beam voltage of 10 kV is relatively low,the sizes of SDRWS still remain relatively large,meaning that SDRWS is in favor of evading the difficulties in manufacturing.A process based on wire el...