Studies on Traveling Wave Tubes With the Bunching Mechanism of Resistive Wall and the Circuit-Field Synchronous Interaction

There is no interaction between the circuit wave and the electron beam in resistive wall amplifiers (RWAs), and the further bunching of the electron beam is caused by the interaction between the electron beam and the space charge field driven by the surface plasmons in the resistive wall. However, due to the inability of the resistive wall structure to excite space charge waves, a coupling system is necessary to pre-modulate the electron beam. Consequently, the tube length of RWAs is relatively longer for the same gain. This article aims to integrate the bunching mechanism of RWAs with the interaction mechanism of traditional traveling wave tubes (TWTs), so that there is both an aiding effect of the space charge field on bunching and a synchronous interaction between the circuit-field and the electron beam in a TWT. The calculation results suggest that this new integrated mechanism not only reduces the tube length but also improves the gain.