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推导得到了有外加磁场情况下强流相对论电子束在中性气体中产生的等离子体参数、等离子体电流和束产生电场的理论公式，通过编程计算得知最佳气体压强值随电子束峰值电流的增大而增大，电子束脉冲前沿上升越快最佳气体压强值就越高．当电子束的峰值电流为５００ｈＡ、峰值电压为１．０ＭＶ、电流脉冲前沿上升时间为６０ｎｓ时，氮气的最佳气体压强为３３２Ｐａ，即当气压力３３２Ｐａ时净电流和平均电场强度近似最低，有效传输的气压范围约为１９９～５３２Ｐａ．实验结果与理论计算符合很好．
The theoretical formula of the plasma parameters, the plasma current and the electric field of the beam generated by the strong relativistic electron beam in the neutral gas under the condition of applied magnetic field is derived. The optimal gas pressure value is deduced from the calculated electron beam peak current Increases and increases, the faster the rising edge of the electron beam pulse, the higher the optimal gas pressure value. When the peak current of the electron beam is 500hA, the peak voltage is 1.0MV, and the rising time of the current pulse is 60ns, the optimum gas pressure of nitrogen is 332Pa, that is, the net current and the average electric field intensity are approximately the lowest when the pressure is 332Pa Transmission pressure range of about 199 ~ 532Pa. The experimental results are in good agreement with the theoretical calculations.