Design of High Power Microwave Ceramic Windows in C-Band

摘要

Two types of microwave ceramic windows capable of propagating ＞1 MW average power operating at 250 kW are developed for 4.6 GHz long pulse lower hybrid current drive system. Using electromagnetic field simulator, HFSS, and the finite element method analysis software, AN-SYS, the electromagnetic and thermal stress performances have been analyzed and simulated. For BeO ceramic disk, the simulation results show that within the bandwidth of 100 MHz, the voltage standing wave ratio is below 1.1, and the maximum temperature difference is below 10 ℃ on the ceramic disk. The thermal stress is within the ability that the ceramic disk could withstand. Cold and high power long pulse tests are also described in this paper. The experimental results show good agreement with the calculated results, and both windows can work well under 250 kW continuous power transmission.