Experiment device for X-band HPM feed output window dielectric breakdown

A new type of X-band horn feed has been designed for the dielectric breakdown experiment of high power microwave(HPM) feed output window. The feed is made of a horn of variable flare angle and a movable dielectric cover. By adjusting the distance between the horn face and the dielectric cover, the electric field on the dielectric cover can be changed. Numerical simulation results show that under the VSWR less than 1.15 and E-plane being equal to H-plane, the variation of electric field intensity is about 32.6 kV·cm-1 to 87 kV·cm-1 for the distance changing from 0 mm to 400 mm. The need of electric field variation for dielectric breakdown is satisfied, when the degree of vacuum is ３×１０-3 Pa, and the pulse width is 20 ns. The experiment device is designed and processed according to the