Thermal Analysis of Slow Wave Structure of 340GHz Folded Waveguide Traveling Wave Tubes

In this paper, the thermal analysis of 340GHz folded waveguide (FW) traveling wave tube (TWT) slow-wave structure (SWS) is carried out by ANSYS software. First, a steady-state thermal analysis model of the SWS is established, including the structural model, boundary conditions and heat loss distribution; Then, the thermal contact resistance (TCR) of the SWS is studied, and it is found that the temperature of SWS and TCR are linearly related. By reducing the TCR inside the folded waveguide, the temperature of the slow-wave structure can be reduced from $98^{\circ}\mathrm{C}$ to $60^{\circ}\mathrm{C}$ .