Simulation study on vertical field distribution of EMP simulator with fast risetime

The inner electric field of EMP simulator with fast rise-time is studied using FEKO which is based on Method of moments(MOM). The simulation result is analyzed and the distribution law of vertical electric field is deduced. The result shows that: (1) the changing trend from center to edge of different level differs in three part, concussion very near the upper transmission line, increasing at first and then decreasing near upper and lower lines, and monotone decreasing other part; (2) the ±10% uniform field area of inner simulator is formed of two parts: one is the area with height of 20% to 85% and width of 80% from the center, the other is the area with height below 20% and width of 30% from the center.