X波段高功率负载的优化设计与测试

利用三维电磁场仿真软件CST进行了圆形水室水负载的仿真设计，先后设计的两种不同规格的负载驻波比分别为1.032 5和1.055 3，在50 MW的峰值功率下，峰值场强分别为21.16 MV/m和17.57 MV/m；并探究了陶瓷片和水的介电性质对驻波比的影响；测试驻波比分别为1.058 2和1.076 3。对一种圆筒水负载进行了优化设计，结果表明其具有很高的功率耐受水平。最后设计了一种不锈钢干负载，对其吸收齿结构和长度进行了优化，使其更利于加工。使用ANSYS对干负载结构进行了热应力分析，结果显示，最高温度和最大应力分别为83.478 ℃和63.917 MPa，最大形变为0.072 971 mm。

Design and test of X-band high power loads

In the research project of high performance free electron laser, it is necessary to absorb the residual power at the end of its acceleration structure. At the operating frequency of 11.424 GHz, the RF load with the VSWR (voltage standing wave ratio) of less than 1.1 and high power absorption capacity needs to be developed. The software CST (Computer Simulation Technology) is used to design the loads. For the cylindrical water chamber water load, the design VSWRs are 1.0325 and 1.0533; At 50 MW peak power, the peak field intensities are 21.16 MV/m and 17.57 MV/m; the test VSWRs are 1.0582 and 1.0763. The effect of dielectric properties of ceramic and water on VSWR is also investigated. For the cylinder-shaped water load, the simulation results show that it has a high power tolerance level. For the dry load, the length of the load and the structure of the absorbing tooth are optimized to make it more convenient for machining. The results of thermal stress analysis calculated by ANSYS show that the maximum temperature and stress are 83.478 ℃ and 63.917 MPa respectively, and the maximum deformation is 0.072 971 mm.