Design of C Band High Power Teflon Water Load

A C band Teflon water load is designed for the 4.6 GHz lower hybrid current drive (LHCD) system in the experimental advanced superconducting tokamak (EAST) to absorb the high power microwave reflected from the circulator, Teflon is used to substitute traditional ceramics to isolate the air and the water, which is cheaper and easier to processed. The simulation result carried out by CST microwave studio shows that the return loss reaches -64 dB at 4.6 GHz, and the power loss density was fitted by Origin software to calculate the thermal distribution of the Teflon and the water. Besides, the thermal analysis carried out by ANSYS indicates that this water load can work under 5 kW CW, with the maximum temperature of Teflon less than 71 °C, and the maximum thermal deformation and stress are no more than 0.14 mm and 3.2 MPa.